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NIH Study Finds Midlife Brain Immune Changes Linked to Aging

Womens Journal Staff 2 on July 25, 2026

An NIH-funded study found that immune cells in the hippocampus undergo substantial changes during midlife, providing researchers with new evidence about biological aging in the human brain. The findings may improve understanding of processes associated with age-related cognitive decline and future dementia research.

Key Takeaways

  • NIH-funded researchers identified major immune cell changes in the hippocampus during midlife.
  • The study analyzed brain tissue from neurologically healthy adults between 20 and 95 years old.
  • Researchers observed a decline in resident microglia alongside the emergence of inflammatory immune cells.
  • Advanced genomic and epigenomic analysis revealed cellular changes not detected through gene expression alone.
  • Scientists said the findings may guide future studies on aging and neurodegenerative diseases.


Researchers supported by the National Institutes of Health have identified significant immune cell changes associated with midlife brain aging, revealing a previously unrecognized transition within the hippocampus that may help explain biological processes linked to cognitive decline and future dementia research. The findings emerged from an analysis of human brain tissue collected from neurologically healthy adults and provide new insight into how aging affects the brain’s immune environment.

The research focused on the hippocampus, a region essential for learning and memory. Investigators reported that the brain’s resident immune cells, known as microglia, decline during midlife while another group of immune cells with stronger inflammatory characteristics becomes more prominent. The study suggests this transition begins between approximately 50 and 75 years of age.

The work received support from the National Institute on Aging, part of the National Institutes of Health, along with funding through the NIH Common Fund’s 4D Nucleome program. Researchers from the University of California, San Diego, the New York Genome Center, and the University of California, Irvine collaborated on the study.

NIH-Funded Research Documents Midlife Brain Aging Changes

Scientists analyzed postmortem hippocampal tissue obtained from 40 neurologically healthy adults ranging in age from 20 to 95 years. Rather than focusing only on disease, the researchers examined normal aging to better understand biological changes that occur throughout adulthood.

The analysis identified a substantial shift in the composition of immune cells within the hippocampus during midlife. Researchers reported that resident microglia gradually decreased while immune cells with characteristics resembling peripheral blood-derived cells became increasingly common.

According to the research team, this transition represents a previously unrecognized feature of aging in the human brain. The findings offer a potential biological explanation for chronic neuroinflammation, which is frequently observed in neurodegenerative disorders. Readers interested in related findings can also explore research on dementia risk factors affecting women.

The National Institute on Aging stated that aging remains the largest known risk factor for dementia, making it important to identify the cellular mechanisms that may contribute to age-related neurological changes.

Immune Cell Analysis Reveals Declining Microglia Population

Hippocampal Tissue Examined Across Adult Age Groups

Microglia serve as the brain’s primary immune cells and play important roles in monitoring the brain environment, clearing cellular debris, and responding to injury or disease. Scientists have long believed these cells originated during embryonic development and continuously renewed throughout life.

The new findings suggest that this long-standing assumption may require reconsideration. Researchers observed that resident microglia progressively declined during midlife while cells displaying inflammatory signatures increased within the hippocampus.

The study did not identify these changes in individuals with neurological disease alone. Instead, the observations came from brain tissue collected from adults without diagnosed neurological disorders, allowing researchers to examine normal biological aging.

Evidence Suggests a Shift in Immune Cell Identity

To distinguish between different immune cell populations, researchers combined several advanced laboratory methods capable of identifying both cellular activity and biological origin.

Gene expression analysis showed which genes individual cells were actively using. Researchers paired those findings with epigenomic analysis, which preserves biological information about a cell’s developmental history.

The combined approach indicated that many immune cells appearing later in life carried characteristics more consistent with blood-derived immune cells than with traditional resident microglia. The researchers reported that this distinction would not have been apparent through gene expression analysis alone.

Advanced Genomic Methods Expand Understanding of Brain Aging

Gene Expression Combined With Epigenetic Analysis

The research team used single-cell genomic technologies to study individual brain cells at high resolution. Alongside gene expression analysis, investigators examined the three-dimensional organization of the genome and patterns of chemical modifications known collectively as the epigenome.

These complementary techniques enabled scientists to evaluate not only how cells functioned but also how they developed and changed throughout aging. The findings complement broader discussions about global aging trends and health opportunities affecting older adults.

Researchers reported that integrating multiple forms of analysis produced a more complete picture of immune cell identity than conventional laboratory methods alone.

The approach also allowed investigators to identify relationships between cellular identity, gene regulation, and structural changes occurring within aging brain tissue.

Genome Architecture Changes Identified Across Cell Types

The study found evidence that aging affected multiple brain cell populations beyond immune cells.

Researchers observed widespread disruption in genome architecture across numerous cell types. Structural changes within chromosomes were associated with corresponding changes in gene regulation and cellular identity.

The findings suggest that aging involves coordinated biological alterations affecting diverse brain cells rather than isolated changes within a single population.

Scientists stated that examining genome organization alongside cellular behavior provides an additional framework for understanding biological aging.

Structural Brain Cell Changes Accompany the Immune Transition

In addition to immune cell remodeling, researchers identified deterioration among cells responsible for maintaining the blood-brain barrier.

The blood-brain barrier regulates the movement of substances between the bloodstream and the brain, helping maintain a stable environment for normal neurological function.

Researchers reported that these supportive cells exhibited age-related deterioration alongside the observed immune transition. Maintaining cognitive health is closely connected to overall well-being, an area also explored through guidance on women’s mental health and wellness.

The combination of immune remodeling, altered genome architecture, and changes affecting blood-brain barrier cells suggests that multiple biological systems change together during aging.

The study did not conclude that these cellular changes directly cause dementia. Instead, researchers described them as potential biological mechanisms that warrant additional investigation.

Future Research Builds on Findings From the NIH-Supported Study

Investigating Links to Neurodegenerative Disease

Researchers stated that future studies will examine why resident microglia decline during aging and determine whether the newly identified immune transition contributes directly to Alzheimer’s disease or other neurodegenerative conditions.

Additional research will also investigate the biological signals responsible for replacing resident immune cells with cells displaying stronger inflammatory characteristics.

Understanding these mechanisms may help researchers better define how normal aging differs from disease-related changes.

Potential Directions for Brain Aging Research

The investigators reported that the findings establish a foundation for future studies examining brain aging at the cellular level.

The research also demonstrates the value of combining single-cell genomics, epigenetic analysis, and genome architecture mapping to investigate complex biological processes.

The NIH-supported study forms part of a broader collection of research exploring how three-dimensional genome organization influences development, aging, and disease.

Researchers stated that continued investigation of these cellular transitions may improve scientific understanding of brain aging and support future research into preserving neurological function during later life.

Frequently Asked Questions

What did the NIH-funded brain aging study discover?

The study found that immune cells within the hippocampus undergo substantial changes during midlife, including a decline in resident microglia and the appearance of immune cells with stronger inflammatory characteristics.

What are microglia and what role do they play in the brain?

Microglia are the brain’s primary immune cells. They help maintain brain health by monitoring the brain environment, removing damaged cells, and responding to injury or disease.

Which part of the brain was examined in the study?

Researchers focused on the hippocampus, a brain region that plays an important role in learning and memory.

How did researchers analyze changes in brain immune cells?

The research combined single-cell gene expression analysis with advanced epigenomic techniques and three-dimensional genome architecture analysis to identify changes in cell identity and function.

What are the next steps following the NIH-supported research?

Researchers plan to investigate the biological mechanisms responsible for the loss of resident microglia and determine whether the newly identified immune cell transition contributes directly to Alzheimer’s disease or other age-related neurodegenerative disorders.

 

Disclaimer:
This article is for informational and educational purposes only.  Readers should consult a qualified healthcare professional regarding concerns about memory, cognitive health, or age-related neurological symptoms.

 

Fairy Tales, Courtrooms, and Nervous Systems, The Astonishing Literary Range of Katherine Wilks

Women's Journal Staff on July 25, 2026

Late at night, after the children are asleep and the dishes are done, millions of Americans conduct private negotiations with themselves. They scroll through trauma forums. They listen to sermons while meal-prepping. They research attachment theory between episodes of children’s cartoons. They search for recipes to reduce inflammation, then pause midway to answer a child’s request for a bedtime story. Modern life, despite its insistence on specialization, is lived as emotional simultaneity.

Which is perhaps why Katherine Wilks feels strangely representative of this cultural moment. Her bibliography refuses neat categorization. It moves from psychological survival guides to children’s fiction, from biblical womanhood to metabolic health, from grief narratives to stories about unicorns questioning their identity. Most publishing industries would advise against such a range. Branding experts would call it unfocused. Yet the very unruliness of her work may be what makes it compelling. Because contemporary readers no longer live compartmentalized lives.

In one corner of her literary world sits Fed the Wrong Way, a critique of modern dietary dogma that interrogates America’s complicated relationship with food, processed nutrition, and chronic illness. The book taps into a growing cultural distrust of institutional expertise. A post-pandemic atmosphere in which wellness has become both deeply personal and politically charged. Wilks frames food not simply as fuel, but as cultural conditioning, inherited fear, and biological confusion.

Elsewhere, books like When We Stop Eating: Fasting, Faith, and the Restoration of the Human Body approach the body through an entirely different lens. Spiritual discipline. Here, fasting is not a punishment but an act of attentiveness. An ancient practice colliding with contemporary exhaustion. In another literary context, these themes might feel ideologically incompatible. She instead positions them as neighboring conversations about restoration, restraint, and the search for meaning within physical existence. And then there are the children’s books.

In lesser hands, titles such as The Cloud That Wouldn’t Rain, I Don’t Want to Be a Unicorn, and Nate’s Daydream Adventures could easily dissolve into sentimental simplicity. Yet she consistently smuggles emotional complexity into seemingly gentle narratives. Her characters fear disappointing others. They question identity. They struggle to belong. Even her most whimsical stories carry quiet psychological undercurrents about self-worth and emotional safety.

This emotional continuity is what binds her otherwise eclectic catalog together. Whether writing about divorce, grief, faith, food, or imaginary adventures, Katherine circles the same enduring questions: What allows a person to feel secure? What happens when identity fractures? How do human beings rebuild trust in themselves, in others, in God and in the future?

Still, the breadth of her work raises provocative questions about contemporary publishing itself. For decades, literary culture rewarded narrow expertise. Authors were expected to occupy singular lanes: the trauma specialist, the theologian, the parenting expert, the novelist. Katherine rejects that architecture entirely. Her work behaves more like modern consciousness itself. Nonlinear, emotionally overlapping, constantly moving between caregiving, fear, spirituality, survival, and imagination.

There is a risk in this. Eclecticism can dilute authority. Readers conditioned by algorithmic recommendation systems often distrust work that refuses a single identity. Her refusal to specialize may ultimately reflect something more truthful about contemporary existence. It is that no one experiences life in one category at a time. A woman recovering from emotional abuse may also be reading Bible studies. A grieving child still needs bedtime stories. A parent researching nutrition may simultaneously be healing from trauma. Human beings do not divide themselves as neatly as bookstore shelves do. Perhaps that is the quiet provocation running beneath Katherine Wilks’ entire body of work.

Not that healing is simple. Not that identity is stable. But the emotional, spiritual, psychological, and imaginative lives people lead have always belonged to the same story, even when modern culture insists on separating them.

How Stefanie Ruth Helps Women Rebuild Self-Trust Through Intuition and Healing

Women's Journal Staff on July 25, 2026

Stefanie Ruth’s work centers on spiritual wellness, self-trust, and personal healing. It is about the courage to stop abandoning your own voice. Her work began with her own transformation, after years of anxiety, self-doubt, and feeling disconnected from herself led her toward Reiki, intuition, and a deeper understanding of personal healing.

That journey now informs everything she offers through Live and Breathe Reiki LLC. As a spiritual life coach, Reiki Master Teacher, author, award-winning podcast host, and intuitive development educator, Stefanie helps women rebuild self-trust from within. Her message is clear: many of the answers women are searching for begin within, waiting beneath the noise of everyday life.

From Communication to Inner Awareness

Before Stefanie became known in spiritual wellness and intuitive development, she studied communication, exploring how people develop language, use their voices, and form meaningful connections with the world around them.

That background gives her story unusual emotional depth. Stefanie once helped others communicate outwardly, but her own journey led her to discover a deeper kind of communication: the conversation between a woman and her own truth. “Our voice is our power, and for so many years, I hid mine,” she has shared.

When Healing Became a Calling

Stefanie did not arrive at this work from a distance. She arrived through her own need for healing. During a chapter shaped by anxiety, self-doubt, and disconnection, Reiki helped her begin listening to herself differently. She came to see Reiki as a practice of returning, not only to calm, but to a deeper sense of personal truth.

That return grew into a path of service. After beginning her Reiki studies in 2011, becoming a Reiki Master Teacher in 2015, and later earning her Karuna Reiki Master Teacher certification in 2022, Stefanie opened Live and Breathe Reiki LLC in 2021. Today, her work supports clients around the world through spiritual education, mentorship, intuitive development, workshops, and private healing experiences.

Helping Women Trust Their Inner Voice

At the center of Stefanie’s work is the belief that intuition is not a rare gift reserved for a chosen few. It is already present, though many women have learned to override it, explain it away, or apologize for it.

“Every person has an intuitive language,” she explains. That idea shapes the way she guides women back to themselves. Some women feel intuition in the body. Some sense it emotionally. Some experience it as a quiet knowing. Stefanie helps them recognize those signals, understand their energetic patterns, and stop dismissing the inner information they have been carrying all along.

Rebuilding Self-Trust

For many women, self-trust is not broken in one moment. It is worn down over years of criticism, over-giving, comparison, fear, and asking everyone else to confirm what they already know. Stefanie’s work helps women notice where they abandoned their own knowing and begin rebuilding inner authority.

Her book, Your Sacred Journey: The Ultimate Guidebook to Align Your Mind, Body, & Spirit, resonated with readers soon after it launched. That response reflected more than commercial success. It reflected the courage to honor her message even when the path required vulnerability. “My truth is mine, and mine alone,” she has said.

Photo Courtesy: Frankie FMACreates

Creating Space for Personal Growth

Stefanie’s work does not position women as broken. “Rather than ‘fixing,’ I help you understand yourself more deeply…” is one of the clearest ways to understand her approach. Her offerings are designed to create supportive spaces for personal growth. Through Reiki, spiritual coaching, intuitive development, mentorship, courses, workshops, and private sessions, Stefanie creates spaces where women can return to themselves with more clarity, softness, and trust.

Many people describe finding in Stefanie’s work not only guidance, but a feeling of being deeply met. A client navigating the grief of losing her mother described the experience in words that speak directly to the heart of Stefanie’s work: “Basically, I was enveloped with love.” Another listener of When Spirit Talks called Stefanie “very relatable and authentic,” adding that “it just feels good listening to her insight.”

Together, those responses point to the heart of Stefanie’s work: helping women feel safe enough to listen inward, trust what surfaces, and return to themselves with more softness and clarity.

Expanding the Conversation Through When Spirit Talks

With When Spirit Talks, Stefanie creates a space where listeners can explore the inner experiences they may have felt but never fully understood. Through conversations on intuition, spiritual signs, energy, and transformation, she helps listeners explore experiences that may feel unfamiliar with greater understanding and confidence. The podcast’s 2026 Women Podcasters Award for Best Inspiration & Motivation Podcast reflects the growing resonance of that message.

Her message has also reached audiences through guest features on platforms such as Let’s Talk Vibes: The Soul Contract Podcast and Talk Spirit to Me. In the former, she discussed healing with Reiki and the role energy work can play in personal growth. In the latter, she explored the role of energy in emotional wellbeing, bringing spiritual insight into everyday questions about how people feel and process their experiences. These appearances extend the same conversation at the heart of her work: helping people trust what they feel, sense, and know.

Recognition That Reflects Her Growing Work

The public recognition around Stefanie’s work is not simply about visibility. It reflects a message that is meeting women where they are. Alongside features in Authority Magazine and Spirituality + Health Magazine, these milestones show how her work has grown from personal healing into work that continues to connect with a wider audience.

For Stefanie, public recognition has always remained secondary to the personal growth her work encourages. It is what visibility required from her. “When I stopped hiding my intuitive side and started sharing it, everything changed.”

A Return to Self

Stefanie Ruth encourages women to build confidence by strengthening their relationship with themselves. In a world that often rewards women for abandoning themselves, she offers a softer but stronger invitation: listen again. The voice within deserves to be heard. It may be the beginning of your return.

Energybits Product Portfolio and Formulation Approach in Algae-Based Food Tablets

Women's Journal Staff on July 25, 2026

Algae has been used as a food source in several parts of the world for decades, particularly in forms such as spirulina and chlorella. In the United States, however, it remained a relatively limited category within the broader nutrition market for much of the late 20th century and early 2010s. It was available in health-food channels, but it rarely functioned as a distinct consumer food category on its own.

ENERGYbits Inc., founded in Boston in 2010 by Catharine Arnston, developed its product structure around this specific ingredient base. The company’s portfolio is centered on spirulina and chlorella, two types of microalgae that are cultivated and processed for human consumption in various international markets. Rather than expanding across multiple ingredient systems, the company focused on a narrow formulation approach built entirely around these two sources.

The core format used across the product line is a compressed tablet made from dried algae. According to company descriptions, the tablets are produced without binders, fillers, sweeteners, or additives. The result is a single-ingredient structure in which the algae itself is pressed into a consumable form. This production method is consistent across all main product lines.

Four primary products form the company’s current portfolio. ENERGYbits is based on spirulina. It is positioned in company marketing around general daily nutrition use and energy-related messaging. RECOVERYbits is based on chlorella. It uses the same tablet structure but shifts ingredient selection to a different microalgae species.

VITALITYbits combines spirulina and chlorella in a single tablet format. It represents a blended formulation within the same production system.

BEAUTYbits returns to spirulina and is positioned in marketing materials around appearance-related nutrition themes.

While the names and positioning differ, the underlying formulation remains consistent. The company does not introduce additional plant or protein sources beyond spirulina and chlorella in its core product range. This creates a product structure defined more by naming and positioning than by ingredient variation.

The company’s origin is commonly linked in interviews and public statements to a personal health situation involving Arnston’s family in 2008, when her younger sister was diagnosed with breast cancer. Arnston has stated that this event led her to research dietary patterns, including alkaline-focused diets, during which she encountered spirulina and chlorella. That narrative appears in company materials and interviews, although the products themselves were later developed as commercial food tablets.

ENERGYbits entered a U.S. market where algae-based foods were not widely categorized as standalone consumer products. Spirulina and chlorella were already present in health-food retail channels, but they were typically distributed as part of broader supplement inventories or blended formulations rather than as a dedicated branded food line.

The company’s approach remained centered on direct consumption tablets rather than powders or mixed products. All four product lines follow this same structure. No additional ingredients are used to modify taste, texture, or composition. This distinguishes the portfolio from many nutrition brands that expand through multi-ingredient formulations.

Marketing positioning differs across the four product names. ENERGYbits is associated with general daily use. RECOVERYbits is framed around post-activity or recovery-related messaging. BEAUTYbits is positioned in relation to skin, hair, and nail-related themes. VITALITYbits combines the two algae types and is positioned as a broader-use product. These categories are based on company labeling and consumer-facing descriptions rather than independently established functional classifications.

The consistency of formulation has been a defining feature of the company’s structure. Across all product lines, spirulina and chlorella remain the only active ingredients. The differentiation occurs at the level of naming and intended usage context rather than chemical or nutritional variation.

In regulatory and commercial terms, algae-based foods occupy an overlapping space between food and dietary supplement categories in the United States, depending on labeling and distribution method. ENERGYbits presents its products as whole-food algae tablets, a framing that aligns with its single-ingredient formulation approach.

Over time, the product portfolio has remained stable in structure. The company has not introduced additional ingredient categories beyond spirulina and chlorella. Instead, its product development has focused on variations within that limited base.

Disclaimer: These statements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before making dietary changes.

How Fai Chan Built a Career Connecting Aromatherapy, Wellness, and Research

Women's Journal Staff on July 25, 2026

Professional reinvention does not always begin with a business plan. For Fai Chan, it began in Jackson, Mississippi, where life as a homemaker felt limiting. She wanted financial independence, renewed purpose, and proof that she could create something of her own. An aromatherapy class became her first step. “I learned aromatherapy because I wanted to create a future for myself,” she says.

That decision developed into a career spanning more than 12 years in health and wellness. Today, Fai is a clinical aromatherapist, published author, and founder of Austin-based Deli Aroma LLC. Her story is about more than discovering a professional interest. It reflects her journey of building an identity beyond the role that once defined her daily life.

From Personal Growth to Entrepreneurship

Financial independence mattered, but Fai’s reasons ran deeper. “Self-worth is what I wanted to build up,” she has explained. Her experience with debilitating acne scarring also influenced her direction. The insecurity surrounding her skin led her to explore aromatherapy and the relationship she perceived between physical care, emotional well-being, and confidence.

What began with one class required sustained study, formulation work, consultations, and writing. Without following a conventional corporate path, Fai built her experience incrementally and developed Deli Aroma around what she learned. The company became both a commercial venture and an important milestone in her professional journey, allowing her to turn curiosity into a career of her own.

A Broader Perspective on Aromatherapy

Fai encourages people to view aromatherapy through a broader lens than fragrance, luxury, or temporary relaxation. Her approach draws from clinical aromatherapy, traditional Chinese medicine, and pharmacology. By connecting these perspectives, she aims to make complementary wellness more structured and attentive to the broader context in which someone receives care.

This is especially relevant for clients already using conventional medicine. Fai says she encourages them to communicate with qualified medical professionals and keep a journal. Her work is intended to complement, not replace, conventional treatment. While she is interested in exploring how complementary protocols may support well-being, those goals should not be interpreted as independently established medical outcomes.

Bringing Research Into Wellness

Research helps Fai distinguish her work from consumer-focused aromatherapy. She has authored papers exploring inflammation, rheumatoid arthritis, cognitive health, and integrative practice. One exploratory study she authored describes an aromatherapy-based procedure applied with three individuals who have rheumatoid arthritis. She has also presented at traditional-medicine conferences.

Fai also says she conducts peer review involving natural and conventional medical research, an experience she believes helps her consider both approaches. Publication does not, by itself, establish that a protocol is clinically effective, but it demonstrates her willingness to document ideas and contribute to a formal research conversation. Her work reflects an interest in examining aromatherapy through a more structured and evidence-informed perspective.

Encouraging a More Structured Approach

Much of the wellness market depends on broad promises that are difficult to measure. Fai wants her practice to move in a more outcomes-conscious direction. She says she asks detailed questions, conducts follow-ups, documents processes, and encourages clients to record changes over time. That information can also support more specific conversations with the licensed professionals overseeing their medical treatment.

Her emphasis on documentation is paired with a highly personal service philosophy. “I take joy in knowing my clients personally, and am devoted to giving them personalized care,” she says. For Fai, structure and personalized care work together to create a clearer picture of an individual’s experience while avoiding conclusions that go beyond the available evidence.

Growing Deli Aroma

Deli Aroma currently speaks to two audiences. Its consumer-facing side offers aromatherapy and self-care products intended for home use, including options for people who want to continue elements of their routines outside consultations. The company also says it considers sustainability when sourcing ingredients, reflecting an awareness that wellness products carry environmental as well as personal responsibilities.

The second direction is more ambitious. Fai wants her writing and protocol development to interest pharmaceutical companies and university laboratories. She envisions research rights being acquired or developed through licensing arrangements, although these are goals rather than completed partnerships. Together, the two sides reveal a founder balancing an accessible retail business with a longer-term desire to participate in institutional research.

Recognition Along the Way

Recognition has accompanied Fai’s professional evolution. Deli Aroma was named Best Essential Oils & Aromatherapy Products Provider – Central Texas in LUXlife’s 2022 Health, Beauty & Wellness Awards and Most Innovative Aromatherapy Products Provider – Texas in 2024. Fai also reports receiving Best Article of the Year recognition from Biochemistry & Analytical Biochemistry in 2023 and 2024.

For Fai, however, achievement is no longer defined by individual distinctions alone. After turning 40, she began viewing success differently. “Success is persistently meeting the goals,” she says. Her perspective reflects a shift toward the consistent work of learning, publishing, and continuing to develop her professional direction.

Looking Ahead

That commitment to continued progress now shapes Fai’s future plans. She intends to explore immunology more deeply, with research interests that include ALS, Alzheimer’s disease, and diabetes. These remain areas of investigation rather than established treatments, but they demonstrate the scale of the questions she hopes to examine through her integrative perspective.

What began as Fai Chan‘s desire to earn independently became something far greater: the creation of a professional identity entirely her own. Through Deli Aroma, she transformed personal uncertainty into purpose and curiosity into a developing body of work. Her story shows that the courage to begin can eventually become the power to redefine one’s life.