Ketosis is a survival mechanism, not a diet.

I am writing this blog because I am seeing far too many women and men begin ketogenic diets with the promise of dramatic health benefits, only to eventually develop symptoms that suggest the body is struggling rather than thriving. Many people initially experience weight loss, appetite suppression, increased stimulation, or temporary improvements in certain biomarkers, which understandably leads them to believe the diet is deeply healing. However, when we look more carefully and more holistically at the body over time, a different picture often begins to emerge.

What concerns me is not that ketosis exists. Ketosis is a very real and intelligent physiological mechanism. The issue is that modern wellness culture has begun treating a survival adaptation as though it is the body’s ideal long term state. The body does not enter ketosis because it perceives abundance and safety. It enters ketosis because it perceives scarcity.

Today, there is a great deal of conversation surrounding ketones, fasting, autophagy, immune signaling proteins, mitochondrial efficiency, and cellular repair pathways. Many of these discussions are rooted in legitimate research. However, the interpretation of that research is often incomplete because we tend to isolate one biochemical mechanism and assume that if it appears beneficial in one context, then producing more of it indefinitely must therefore improve health universally.

But physiology does not work that way.

The question should not simply be, “How can we produce more of this protein or activate this pathway?” The more intelligent question is, “Why is the body producing this response in the first place, and what is the body attempting to adapt to?”

Ketosis Is an Adaptive Survival State

Ketosis occurs when carbohydrate availability becomes low enough that the body begins shifting away from glucose metabolism and toward ketone production in order to preserve energy supply, particularly for the brain. This is a remarkable survival adaptation.

Historically, humans needed the ability to survive famine, seasonal scarcity, migration, illness, food shortages, and periods where nourishment was unpredictable. Without the ability to enter ketosis temporarily, survival during these conditions would have been far more difficult.

The body is incredibly intelligent. When food becomes scarce, it begins reallocating energy resources, mobilizing stored fuel, altering hormone signaling, suppressing appetite, and increasing stress adaptation pathways in order to preserve survival. I feel it is important to note that ketosis is not inherently pathological. It is adaptive. However, adaptation and optimization are not the same thing.

One of the major problems within modern nutrition culture is that we often confuse the body’s ability to compensate under stress with evidence that the stress itself is ideal indefinitely.

Why “Beneficial” Stress Responses Can Be Misleading

One of the most common arguments in favor of ketogenic diets is that ketosis increases certain proteins associated with cellular repair, immune modulation, antioxidant activity, and stress resilience. This is all true… to a degree.

But first, we must ask why these pathways are being activated. The body does not activate emergency physiology casually. It activates these pathways because it perceives a need to adapt to stress, scarcity, or instability. This principle exists throughout physiology.

For example, when the body is exposed to extreme cold, it temporarily increases stress hormones and inflammatory regulators in order to survive the stressor. During periods of sleep deprivation, the body may temporarily increase adrenaline and cortisol in order to maintain alertness. During intense stress, the immune system may become temporarily hypervigilant. Just because certain immune biomarkers are increased, does not mean the body prefers remaining in those states chronically.

The production of stress response proteins during ketosis is often interpreted as proof that ketosis itself is inherently superior. But many of these responses are protective compensations designed to help the body survive under demanding conditions.The body is adapting because it must.

There is a meaningful difference between a body that is deeply nourished and stable versus a body that is surviving efficiently under physiological stress.

Ayurveda Has Long Recognized This Principle

Ayurveda has always understood that the body can function impressively under strain for a period of time while simultaneously becoming progressively depleted underneath.

Ayurveda cautions against chronic depletion, excessive fasting, overexertion, tissue wasting, and prolonged undernourishment. It does recognize that temporary lightening therapies (langhana) can have therapeutic value in certain clinical situations, particularly in conditions involving excess Kapha or Ama, but these interventions were never meant to become permanent lifestyles for everyone.

The body ultimately requires consistent nourishment in order to maintain healthy tissues, reproductive vitality, hormonal stability, nervous system regulation, and immune resilience. This is one of the areas where I believe many people misunderstand the difference between stimulation and health.

A person may initially feel highly energized during ketosis because the body is producing stress hormones and mobilizing emergency fuel sources more aggressively. When the body is in a stress response, our appetite naturally decreases, our mental sharpness temporarily increases, and our weight may rapidly decrease. Additionally, inflammatory markers may improve transiently.

But that does not necessarily mean the body is deeply nourished or stable long term.

In practice, I often see people eventually develop symptoms such as insomnia, anxiety, constipation, irregular menstrual cycles, hair loss, dryness, poor recovery, fatigue, irritability, reduced resilience, and nervous system dysregulation after remaining in prolonged states of restriction or chronic ketosis.

The Body Thrives Through Stability, Not Chronic Survival Signaling

One of Ayurveda’s foundational principles is that the body thrives through consistency, nourishment, rhythm, and predictability.

The nervous system functions best when it perceives stability and safety. Digestion functions best when meals are regular and appropriately nourishing. Hormones function best when the body is adequately fed and rested. Tissue regeneration occurs most efficiently when the body is not constantly diverting resources toward survival.

When the body perceives prolonged scarcity, it shifts priorities. Instead of prioritizing repair, reproduction, fertility, and long term restoration, the body begins prioritizing immediate survival. This is a beautiful and remarkably intelligent adaptation. The issue lies in remaining chronically within survival physiology which eventually comes with tradeoffs.

The Problem With Reductionist Nutrition

One of the deeper issues within modern health culture is that we increasingly view the body through isolated mechanisms instead of through systems and relationships. We identify one protein, one hormone, one pathway, or one biomarker and attempt to maximize it indefinitely without considering the broader physiological consequences.Our bodies are far more sophisticated than that.

Inflammation itself is not inherently bad. We need inflammation for healing. Cortisol is not inherently bad. We need cortisol waking up in the morning. Stress adaptation pathways are not bad, we need them in order to survive.

The question is not whether a pathway exists.The question is whether the body is having to rely excessively on survival physiology in order to maintain function. Ayurveda consistently evaluates health through a broader holistic lens of all the systems working together.

The Goal Is Not Constant Stress Adaptation

I think one of the most damaging ideas in modern wellness culture is the belief that health is created by continuously forcing the body into increasingly intense adaptive states without understanding that our physiology does not become resilient through endless escalation.

True resilience is built through adaptability combined with nourishment, recovery, stability, and proper regulation.

Just to be clear, this does not mean ketogenic diets are universally harmful or that ketosis has no clinical use. There may absolutely be situations where lower carbohydrate diets or temporary therapeutic ketosis are appropriate and beneficial under proper supervision.

However, I believe we should be much more cautious about romanticizing survival physiology as the ideal long term state for everyone.

The more important question is not simply how to activate a protective response. The more important question is why the body is needing to activate that response in the first place, what tradeoffs are occurring underneath, and whether the body as a whole is becoming more resilient or more depleted over time.