More Than Weight Loss: Why People Really Go Keto

Ask most people what a ketogenic diet is for, and you will hear one answer: losing weight.

It is easy to see why. Weight loss is the reason keto went mainstream, the reason it trends on search engines every January, and often the reason someone first types the word into their phone at eleven at night. And to be clear, it works well for that. But here is the part that surprises almost everyone: weight loss is not why the ketogenic diet exists. It was not invented in a gym or a magazine. It was invented in a hospital, to treat a serious neurological condition, and it has been quietly doing medical work for a hundred years.

When you understand where keto actually comes from, the whole picture changes. The scale stops being the point and becomes just one summit among many. So let me walk you through the real reasons people choose this way of eating, the ones that rarely make the headlines. Think of them as separate peaks on the same mountain range: different destinations, one path up.

If you've tried before and it didn't last, in my experience it usually isn't a willpower problem. More often, nobody helped you build a plan that fits your life.

1. It began as a treatment for epilepsy, and still is one

Long before anyone posted a keto meal on social media, doctors noticed something strange: children with epilepsy had fewer seizures when they fasted. The first modern scientific study into fasting for epilepsy was conducted in France in 1911. Fasting can't go on for long, so researchers went looking for a way to get the same effect from food. In the early 1920s, Dr. Russell Wilder at the Mayo Clinic developed a way of eating he called the ketogenic diet, designed to trick the body into thinking it was fasting by giving it lots of fat and very little carbohydrate.

It worked, and it is still working today. Johns Hopkins has become one of the world's leading centres for this treatment; its pediatric epilepsy team has almost 100 years of experience treating epilepsy with the ketogenic diet, and more than 1,500 children have been through its program. The diet is used specifically for drug resistant epilepsy, meaning seizures that have not responded to medication, and the effect can be remarkable. The most famous case is a two year old boy named Charlie Abrahams, whose story helped revive the whole field in the 1990s: treated with the ketogenic diet in 1994, he became seizure free within a month. His family founded the Charlie Foundation, which still promotes the therapy today.

This is where it all started. Much of today's research starts from the same idea: it changes the fuel your brain runs on. Researchers are now asking whether that matters beyond seizures.

2. It's being studied for type 2 diabetes remission

If there is one reason that deserves to be as famous as weight loss, this is it.

Type 2 diabetes was long considered a chronic, one way street: you manage it and you medicate it, and that's all. Research on cutting carbohydrates has started to question that idea. One of the best known studies is a two year trial run by the company Virta Health and published in Frontiers in Endocrinology in 2019. It followed 262 adults with type 2 diabetes on a supported ketogenic diet, without random assignment to groups. On average their HbA1c (a three month blood sugar average), fasting insulin and weight came down, and many needed less diabetes medication, with their doctors managing those changes. In a large study of usual diabetes care, remission without surgery was rare (Karter and colleagues, Diabetes Care, 2014).

The reason it works comes down to a simple idea. Type 2 diabetes is, at its heart, a disease of too much blood sugar and too much insulin. Eating fewer carbohydrates means less sugar coming in, so blood sugar and insulin often come down. That's the idea researchers are testing. A 2025 review of six longer studies found lower HbA1c, weight and blood pressure on low carbohydrate and ketogenic diets, with remission most common in the first year. Other reviews, including one in the BMJ in 2021, found the benefits were strongest at six months and smaller by twelve, and the evidence is still limited.

One honest note: studies suggest it tends to work best earlier on, and the benefits don't always last. Over time, some weight can come back and blood sugar can creep back up, which is exactly why the support around the diet matters as much as the diet itself. More on that at the end.

3. It is being studied as a treatment for mental illness

This is the area I find most interesting, and the science is moving quickly.

There is a growing field called metabolic psychiatry, built on a striking idea: that some mental illness may be rooted in how the brain produces and uses energy, not only in brain chemistry. One group sharing this research with the public is Metabolic Mind, a nonprofit started by the Baszucki family. As they put it, ketogenic diets are not just for weight loss, and for many people they can be a cornerstone of both metabolic and mental health.

Here's the idea. Some researchers think inflammation, how brain cells make energy, and insulin resistance may play a part in some mental illness. A ketogenic diet gives the brain an alternative, steady fuel in the form of ketones, which may help where the brain struggles to use sugar for fuel. Researchers are now studying this seriously across depression, bipolar disorder, schizophrenia, anorexia, PTSD and ADHD. The early reports are small. One described three adults whose depression and anxiety improved over 12 to 16 weeks on a ketogenic diet with close care from a psychiatric team and a dietitian.

I want to be careful and honest here, because this is people's health, not a headline. This research is young, much of it is early stage, and a ketogenic diet is not a replacement for psychiatric care. If you'd like to read more, Metabolic Mind and Dr. Georgia Ede's book Change Your Diet, Change Your Mind explain the research. Please talk with your own doctor or psychiatrist before changing anything.

4. It's being studied for the aging brain

Related to mental health, but its own peak: cognition and the aging brain.

Here is the idea in one sentence. In Alzheimer's disease, the brain's ability to use glucose for fuel declines from an early stage. A ketogenic diet offers the brain a different fuel that does not depend on that broken pathway. Researchers are actively testing whether this helps. Early studies are small but interesting. In one 2021 trial of 26 people with Alzheimer's, those on a modified ketogenic diet for 12 weeks reported better daily function and quality of life. Reviews say more and larger studies are needed.

Some people tell me they feel sharper and steadier on this way of eating. That's their experience, not proof, and the research is still going.

5. It's being studied for PCOS and hormone health

Polycystic ovary syndrome, now being renamed polyendocrine metabolic ovarian syndrome (PMOS) by the Endocrine Society, is one of the most common hormonal conditions in women, and it is deeply tied to insulin. It affects somewhere between 6 and 20 percent of women of reproductive age and is one of the most common causes of infertility. For many women with PCOS, insulin resistance is part of the picture, and it can push up other hormones that affect ovulation.

That's why researchers are studying ketogenic diets for PCOS. A 2026 review that pooled many studies found lower weight, less insulin resistance and changes in some reproductive hormones. One small report also looked at fertility markers. These studies are short and still early.

The usual honesty applies: much of this research is still short term and early, and it is a conversation to have with your own doctor. Many of the benefits appear to be driven by weight loss and improved insulin sensitivity rather than ketosis alone. But for a condition where insulin sits at the centre, an approach built around lowering insulin makes a great deal of sense.

6. The common thread: insulin resistance and inflammation

Step back from any single disease and you find a common thread running through most of them: insulin resistance and chronic inflammation. This is the quiet, upstream problem that shows up in diabetes, in heart risk, in fatty liver, in PCOS, and increasingly in brain conditions too.

If you carry weight around your middle, or your doctor has mentioned your heart numbers, insulin resistance is often part of what links them. Your doctor can tell you what your own numbers mean.

That shared thread may be one reason keto keeps coming up in research on so many conditions. When blood sugar rises less often, insulin tends to come down. In the two year Virta trial, people also saw lower triglycerides, fasting insulin and HbA1c and higher HDL cholesterol on average. Non alcoholic fatty liver disease, one of the most common liver conditions in the world, is another area where researchers are studying the effect of carbohydrate restriction on the fat stored in the liver.

You don't need a diagnosis to care about this. Steady energy and good blood sugar are worth working on, whatever your starting point.

7. Why many people stay with it: they say they feel better

The seventh reason is the least clinical, and it's the one people who write about eating this way mention most.

Ask them why they keep at it, and they rarely lead with lab numbers. They talk about steady, all day energy without the crashes. A clear head. Sleeping better. The disappearance of constant cravings and the mental noise around food. Some say their joints ache less, or their mood holds better on a hard day. These aren't research findings, but they matter to the people living them.

This matters because a way of eating you actively enjoy is one you can sustain, and that is what keeps it going. The best diet in the world does nothing if you cannot live on it. When the food is genuinely good and the day feels better, staying the course stops being a battle of willpower and starts being an easy choice.

One path, many summits

Notice what ties all seven reasons together. Whether the goal is fewer seizures, steadier blood sugar, a clearer mind, balanced hormones or simply more energy, the idea underneath is similar: change the fuel, and insulin often comes down. Researchers are still working out how much that explains. Weight loss, if it comes, is only one part of the picture.

So if you have been thinking about keto and quietly telling yourself it is only for people trying to lose weight, I hope this widens the map. There are many good reasons to make this climb, and yours is valid whatever it is.

Where The Lookout comes in

Here's what I believe, and it's why I coach. Knowing all these reasons isn't the same as knowing how to begin, and beginning isn't the same as keeping it going. In the Virta trial, people had a health coach and a medical team with them the whole way. Support like that is part of what was being tested.

That's what my program The Lookout is for. It isn't only for people chasing a number on the scale. It's for anyone who wants to eat this way well, for any of the reasons on this page, and would rather not figure it out alone. I help you plan a route that fits your life, and we work through it together, one week at a time.

You choose why you're climbing. You're the climber. I'm your coach.

Want to talk about your starting point? The call is free, 15 minutes, by video.

Book Your Free Discovery Call

Or compare the three coaching programs side by side.

You can also listen to my podcast, Lessons from the Ketoverse, on Apple Podcasts and Spotify.

This article is general education, not medical advice. A ketogenic diet is a significant change, and several of the uses described here are active areas of research rather than settled treatments. Always work with your doctor before making dietary changes, especially if you take medication or manage a health condition, and never start, stop or adjust medication on your own.

Sources

• Johns Hopkins Medicine. Ketogenic diet timeline and diet therapy pages. hopkinsmedicine.org
• Wheless JW. History of the ketogenic diet. Epilepsia. 2008. doi:10.1111/j.1528-1167.2008.01821.x
• International League Against Epilepsy. Food for thought: the ketogenic diet as epilepsy treatment. Epigraph, Fall 2020. ilae.org
• Athinarayanan SJ, Adams RN, Hallberg SJ, McKenzie AL, et al. Long term effects of a novel continuous remote care intervention including nutritional ketosis for the management of type 2 diabetes: a 2 year non randomized clinical trial. Frontiers in Endocrinology. 2019. doi:10.3389/fendo.2019.00348
• Das R, Mohammad N, Islam MS, Das S. Long term efficacy and safety of a low carbohydrate diet in type 2 diabetes remission: a systematic review. Cureus. 2025. doi:10.7759/cureus.93340
• Goldenberg JZ, Day A, Brinkworth GD, et al. Efficacy and safety of low and very low carbohydrate diets for type 2 diabetes remission. BMJ. 2021. doi:10.1136/bmj.m4743
• Karter AJ, et al. Incidence of remission in adults with type 2 diabetes: the Diabetes and Aging Study. Diabetes Care. 2014;37(12):3188 to 3195.
• Fante C, Spritzler F, Greenow D, Deloudi S, et al. Ketogenic metabolic therapies for psychiatric and neurodevelopmental disorders. BJPsych Open. 2025. doi:10.1192/bjo.2025.10128
• Calabrese L, Frase R, Ghaloo M. Complete remission of depression and anxiety using a ketogenic diet: case series. Frontiers in Nutrition. 2024. doi:10.3389/fnut.2024.1396685
• Metabolic Mind. metabolicmind.org
• Osmind. Interview on metabolic psychiatry (company blog).
• Phillips MCL, Deprez LM, Mortimer GMN, Murtagh DKJ, et al. Randomized crossover trial of a modified ketogenic diet in Alzheimer's disease. Alzheimer's Research and Therapy. 2021. doi:10.1186/s13195-021-00783-x
• Rong L, Peng Y, Shen Q, et al. Effects of ketogenic diet on cognitive function of patients with Alzheimer's disease: a systematic review and meta analysis. Journal of Nutrition, Health and Aging. 2024. doi:10.1016/j.jnha.2024.100306
• CETOMA trial record. ClinicalTrials.gov NCT04701957
• Schweickart A, Batra R, Neth BJ, Martino C, et al. Serum and CSF metabolomics analysis shows Mediterranean ketogenic diet mitigates risk factors of Alzheimer's disease. npj Metabolic Health and Disease. 2024. doi:10.1038/s44324-024-00016-3
• Arsenaki E, Stathi D, Triantafyllidis K, et al. The effects of ketogenic diet on polycystic ovary syndrome: a systematic review and meta analysis. Clinical Nutrition. 2026. doi:10.1016/j.clnu.2025.11.019
• Tsushima Y, Nachawi N, Pantalone KM, Griebeler ML, et al. Ketogenic diet improves fertility in patients with polycystic ovary syndrome: a brief report. Frontiers in Nutrition. 2024. doi:10.3389/fnut.2024.1395977
• Cleveland Clinic Consult QD. Study looks at ketogenic diet to treat PCOS and infertility.
• Endocrine Society. Polyendocrine metabolic ovarian syndrome: new name for PCOS. 2026. endocrine.org