Keto vs Mediterranean Diet: What One Body Measured Shows

In the keto vs Mediterranean diet question, a recent clinical trial gave keto the bigger metabolic benefits on average, including liver fat and blood sugar. But when Dr. Mike measured his own body month by month, he did best on vegetation with some fish. Neither one wins outright. The answer depends on who gets measured and what they actually eat.

Keto vs Mediterranean diet: which one did the trial pick?

The trial picked keto. The evidence says a ketogenic diet beat both a Mediterranean diet and a low-fat diet on several metabolic markers in people with obesity, prediabetes and fatty liver disease. That same report says keto cut liver fat by 67% and helped about half of the keto group get out of the prediabetes range.

Now look at the sample size. The trial studied 42 adults, and the coverage itself calls that small sample a caveat. That is not a knock on the researchers. It is just what a trial is. It gives you the group average, and nobody in the study is actually the average.

Other trials point the other way. A Stanford crossover study of 33 adults put each person on both diets for 12 weeks. Blood glucose improved on both, and the authors still gave the Mediterranean diet the edge overall. Two good studies, two different answers. So the real question is what happens to you.

What is the keto diet, and what is the Mediterranean diet?

Keto cuts carbohydrates low enough that your body runs mostly on fat and ketones. The Mediterranean diet is built on plants, olive oil and fish. Harvard Health describes it as whole grains, fruits, vegetables, nuts, beans and olive oil, with small amounts of fish, eggs, dairy and meat.

That leaves a lot of overlap. A well-built keto plate has vegetables, fish and olive oil too. The big split is grains, legumes and fruit. One diet is built around those foods and the other mostly drops them. Both drop the junk.

Here is the real problem. Each label covers a huge range of plates. Twenty plain fast-food patties a day technically count as keto, and so does salmon over greens cooked in olive oil. If you lump those together, you aren’t comparing diets anymore. You’re comparing words.

What did Dr. Mike's months show that a trial average can't?

They showed one body’s answer changing as the food changed, even while the macros stayed similar. The film shows Dr. Michael Brandon, a fit doctor, eating 20 plain fast-food patties a day for 30 days. That meant no bun, no condiments and water only, with bloodwork before, during and after.

On paper, that month was keto. In practice, Dr. Mike wrote about dizzy spells, nausea and losing interest in food. On Day 12 he wrote that he had started setting alarms to remind himself to eat. On Day 19 he wrote that his HRV had dropped by half within the first week and was only a little over halfway back to baseline. On Day 29 he called the fitness retest “freaking miserable.” His ARX numbers were record lows for him, and his mile was his worst “since maybe middle school.”

Then came the months a trial never runs on one person. After the burgers came a keto-pescatarian reset month, and he recovered. On a later month of grass-finished beef, he declined again, though less. The book concludes he does best on vegetation with some fish. The film suggests that the quality of the food mattered as much as the carb count. That is my interpretation, not a finding.

Does keto reduce fatty liver?

In that trial it did, on average. The evidence says liver fat dropped more on keto than on the Mediterranean or low-fat diets. There’s a related question about why that matters when weight loss is equal, and I covered it in keto diet liver fat.

Here is the test, though. Did the people in that trial eat like Dr. Mike did in the burger month? Almost certainly not. A research kitchen that plans a ketogenic menu isn’t a drive-through. We tried to have the patties analyzed, and every lab either refused or quoted a five-figure minimum. That means we never lab-tested what was actually in them.

Cholesterol is the other half of the story. A meta-analysis found that LDL rose substantially on low-carb diets in people of normal weight, but not in people with a high BMI. A good result for one group can be a warning sign for another.

Why would you transition from the keto diet to the Mediterranean diet?

You’d switch when your own numbers tell you to, not because a headline did. For Dr. Mike, the move toward vegetation and fish followed his measurements. It wasn’t about fashion.

In my experience, people make the switch for a few honest reasons:

• The markers moved the wrong way. Lipids, energy or training numbers drifted, and the drift didn’t stop.
• The food got monotonous. Dr. Mike wrote about missing cooking and craving vegetables. Boring is good, but only up to a point.
• The goal changed. You may start a ketogenic phase to lose weight and then want a pattern you can follow for years.

If you do switch, add carbohydrates back slowly, starting with legumes, whole grains and fruit, and retest after each change. The evidence says the blood sugar benefits of carb restriction showed up at 3 and 6 months but faded by 12 months. That’s one more reason to track your own numbers instead of trusting momentum.

How do you find out which diet works for your body?

You measure before, during and after, one change at a time. If you aren’t testing, you’re guessing. Individual results vary, and that is the whole point of this post.

We tested Dr. Mike at four points: before the burgers, after them, after the reset month and after the grass-finished beef. The labs covered hormones, cardiometabolic markers, liver, thyroid, kidneys and inflammation. The lab we used refused to be part of the film, so I paid for the testing myself. That’s what skin in the game looks like.

Each person’s genetics works like unique software. I personally believe I do well on grass-fed beef with organs, and I treat vegetables as an extra. Dr. Mike’s numbers took him somewhere else. Neither of us is the trial average. For the side-by-side with an all-meat plan, read keto vs carnivore.

Frequently asked questions

The Bottom Line

A trial gives you a group average. Dr. Mike gave us one body measured month after month on burgers, fish and vegetables, and grass-finished beef. The trial picked keto. Dr. Mike’s numbers took him toward vegetation with some fish. Both can be true, because the answer depends on who gets measured and what is on the plate. So which body are you, and what will you do about it?

The film shows how the burger month went, including the bloodwork we only reveal on screen. Watch The Keto Project on Prime Video, or get the book, 600 Burgers in 30 Days, to follow every month as it happened. You can find more ways to watch on our where to watch page.

Sources

• Keto diet cut liver fat by 67% in a clinical trial (ScienceDaily)
• Keto diet cuts liver fat by 67% in new prediabetes study (Fox News)
• Mediterranean diet has advantages over keto in randomized study (Healio)
• Guide to the Mediterranean diet (Harvard Health)
• Increased LDL cholesterol on a low-carbohydrate diet in adults with normal body weight (PubMed)
• Carbohydrate restriction and glycemic control in diabetes (PubMed)
• Comparison of 14 popular named dietary programmes (PubMed)
• Low and very low carbohydrate diets for type 2 diabetes remission (PubMed)
• Major dietary patterns in type 2 diabetes: network meta-analysis (PubMed)