How Managing Suitable Carbohydrates, Insulin & Ketones Lead to Radiant Health

Proven ways to restore radiant health for your mind-body type

This information is intended to present a range of benefits from a diet with significantly reduced carbohydrates, restoration of insulin sensitivity and to support intermittent metabolic ketosis.

Dr. Andrew Koutnik — research scientist and metabolic health specialist, and co-author of the first international clinical guidelines on therapeutic carbohydrate reduction — distinguishes clearly between therapeutic keto (used for epilepsy or serious metabolic disease) and lifestyle keto, where the real goal is not permanently elevated ketones, but metabolic flexibility: the capacity to switch efficiently between fat and glucose as fuel. That flexibility, he argues, may matter more than staying in ketosis indefinitely.

1. Does a Very Low Carbohydrate Diet Improve Insulin Sensitivity Even Without Insulin Resistance?

The honest answer is: it depends on your starting point. A low-carbohydrate diet lowers insulin significantly, indicating a marked improvement in insulin sensitivity — and even if you are not trying to lose weight or battle insulin resistance, there is value in keeping insulin levels low (Reference 1).

However, the evidence shows a clear dose-response relationship with baseline status. A secondary analysis of a weight-loss study revealed a powerful conclusion: the degree to which a person favourably responds to a low-carbohydrate diet metabolically is tied to their initial fasting insulin level. People who were already insulin-sensitive saw little change in fasting insulin on either a low-fat or low-carbohydrate diet (Reference 1).

So the picture is nuanced: in people who are already genuinely insulin-sensitive, a very low carbohydrate diet still keeps circulating insulin lower — which has long-term protective value even if measurable sensitivity scores do not shift dramatically. Think of it as preserving sensitivity rather than restoring it. There is a substantial body of clinical evidence supporting the beneficial effects of lower-carbohydrate dietary patterns on multiple established risk factors associated with insulin resistance and cardiovascular disease (Reference 2).

2. What Else Improves Beyond Weight Loss?

The benefits extend across multiple systems, especially when the approach is intermittent ketosis rather than permanent — which builds metabolic flexibility rather than fixing the body in a single state.

Inflammation & Oxidative Stress

The ketogenic diet has been shown to reduce inflammation, reduce oxidative stress — the cellular damage caused by unstable molecules called free radicals — modulate the gut microbiota, and improve metabolic health markers (Reference 3).

Brain & Mitochondrial Function

Ketogenic diets improve mitochondrial energy metabolism (the efficiency with which cells produce energy), reduce inflammation, reduce oxidative stress, and slow neurodegeneration — the gradual decline of nerve cells. Cognitive function — including working memory and the speed at which the brain processes information — has also been shown to improve (Reference 4).

Mood, Anxiety & Mental Clarity

A ketogenic diet improved mood — including calmness, contentedness, and alertness — compared with those on other diets. Individuals on a ketogenic diet are less anxious and depressed compared with those on other diets (Reference 5).

Blood Sugar Stability

The ketogenic diet promotes fat as a primary energy source, which minimises glucose spikes, lowers insulin secretion, and improves insulin sensitivity. This shift from glucose to ketones provides a more stable energy supply for cells, which can improve cognition and mood (Reference 6).

Energy, Quality of Life & the TG/HDL Connection

Participants in a Stanford pilot study reported improvements in their energy, sleep, mood and quality of life, feeling healthier and more hopeful (Reference 7).

This improvement in energy and quality of life has a meaningful metabolic parallel worth noting. The ratio of triglycerides (TG) to HDL cholesterol is increasingly recognised as a reliable indicator of metabolic health — one that often mirrors the HOMA-IR score used to measure insulin resistance, without requiring a specialist laboratory test. The relationship is straightforward: lower triglycerides combined with higher HDL is a favourable sign of good metabolic function and efficient cellular energy. Higher triglycerides combined with lower HDL tends to signal metabolic dysfunction and poor fat metabolism — an environment in which sustained energy and wellbeing are harder to achieve.

It is worth noting that HDL is considerably harder to raise than triglycerides are to lower. Reducing carbohydrate intake tends to bring triglycerides down relatively quickly — often within weeks. HDL responds more slowly, and — over time — a low carbohydrate diet may create the conditions for it to rise by reducing chronic inflammation (which suppresses the liver's ability to produce HDL), improving insulin sensitivity (which allows the liver to produce and release HDL more efficiently), and supporting greater fat oxidation — the active burning of fat that HDL participates in transporting through the bloodstream. Regular movement, particularly aerobic exercise, further supports this process. A low carbohydrate approach may therefore shift the TG/HDL ratio favourably through two routes simultaneously: lowering TG quite rapidly, and gradually supporting the conditions for HDL to rise.

Epigenetic & Anti-inflammatory Signalling

Beyond energy metabolism, ketone bodies function as signalling molecules that influence gene expression, inflammation, and neurotransmitter balance. β-hydroxybutyrate inhibits histone deacetylases, activating epigenetic and anti-inflammatory pathways (Reference 8).

Addison's Disease

Addison's disease — primary adrenal insufficiency — is a rare condition in which the adrenal glands cannot produce sufficient cortisol and, in most cases, aldosterone. There is currently no published clinical research specifically examining the effect of a ketogenic or very low carbohydrate diet in people with Addison's disease. However, the available evidence and the known physiology allow for some careful observations.

Importantly, Addison's disease already causes pronounced insulin sensitivity — sometimes to a degree that raises the risk of hypoglycaemia (abnormally low blood sugar). This means that many of the insulin-related benefits described in this document — including improved insulin sensitivity and lower fasting glucose — are not applicable in the same way, and in this context, further lowering blood sugar through carbohydrate restriction would need to be managed with considerable care and medical supervision.

Research on very low calorie ketogenic diets has shown that they affect the renin-angiotensin-aldosterone system (RAAS) — the hormonal pathway that regulates sodium and fluid balance in the body (Reference 16). Since aldosterone deficiency is a central feature of most Addison's cases, and ketogenic diets alter sodium and water handling significantly, this is a further reason why careful medical guidance would be essential before any significant reduction in carbohydrate intake.

Where a lower carbohydrate approach may hold some potential benefit in Addison's — provided cortisol replacement is well managed — is in the areas of inflammation, energy stability, and the avoidance of post-meal blood sugar spikes and the energy crashes that can follow. The general anti-inflammatory effects of ketosis could offer some quality of life benefit. But this is reasoning from general evidence rather than from direct research in Addison's patients, and anyone with this condition considering dietary change should do so only under close medical supervision, with full awareness that their hormonal context is fundamentally different from the general population.

3. What Improves for Each Mind-Body Type?

This is where the ancient and modern genuinely converge. Mapping the benefits of intermittent ketosis onto the characteristic vulnerabilities of each dosha reveals a striking alignment.

4. Is There Evidence That a Ketogenic Diet Reduces Cardiovascular Risk?

Yes — with important nuance, particularly regarding the question of LDL cholesterol.

A 2024 meta-analysis published in the American Journal of Clinical Nutrition evaluated the impact of the ketogenic diet on cardiovascular disease risk factors through randomised controlled trials (Reference 11). While the diet demonstrates clear benefits for weight and glycaemic control, the authors note that its impact on total cholesterol and LDL warrants a cautious and individualised approach.

For those with the greatest cardiovascular risk — people with Type 2 Diabetes — a 2024 GRADE-assessed systematic review and meta-analysis of 29 clinical trials found that adherence to a very low carbohydrate ketogenic diet led to significant reductions in fasting blood sugar, HbA1c, and related cardiovascular markers (Reference 12). Importantly, the same analysis found no significant change in LDL levels — suggesting the feared LDL rise is not universal, particularly in those with poor metabolic health to begin with.

The broader cardiovascular picture is largely positive: improvements in triglycerides, HDL, blood pressure, and insulin resistance together shift the overall risk profile favourably. As noted above in the TG/HDL section, these markers are among the most clinically meaningful. Recent evidence confirms that insulin resistance itself is an independent risk factor for cardiovascular disease, and that improving it reduces cardiometabolic events both in people with diabetes and in the general population (Reference 2).

5. Is There Evidence That a Very Low Carbohydrate Diet Improves Sleep Quality?

Yes — and this is one of the more underreported benefits. The evidence is now reasonably consistent across a range of different conditions and populations.

A scoping review covering 20 papers found several changes in sleep quality and structure under ketogenic dietary approaches, including improvement of overall sleep quality, reduced difficulty falling asleep, fewer nighttime awakenings, improvement in daytime sleepiness, and an increase in REM sleep (Reference 13).

In one study within that review, 74.3% of patients were found to have poor sleep at baseline — with 60% experiencing insomnia symptoms. After three months on a ketogenic dietary approach, the proportion with poor sleep dropped from 74.3% to 34.3%, and insomnia symptoms reduced from 60% to 40%. A significant correlation was also observed between increased REM sleep and improved quality of life (Reference 13).

Carbohydrate intake level appears to correlate directly with sleep quality: higher carbohydrate consumption is associated with lower subjective sleep quality and less slow-wave sleep. The ketogenic diet improved subjective sleep quality in both diabetic and psychiatric patients. Narcoleptic patients showed reduced symptoms on a ketogenic diet, and migraine patients experienced both improved sleep quality and reduced insomnia (Reference 14).

A six-month ketogenic diet intervention found significant improvements in daytime sleepiness and screening symptoms of insomnia, sleep apnoea, and restless legs — independent of sleep duration and other sleep disorder factors (Reference 15).

The mechanism appears to be multi-layered: stabilised blood glucose removes cortisol spikes that can cause disrupted and shallow sleep; reduced systemic inflammation calms neurological hyperactivity; and ketone bodies may directly modulate sleep architecture through GABA pathways.