CT Scans Show Keto Diet Dramatically Reduces Visceral Fat

A pair of CT scans shared by Robert Lufkin showed the kind of before-and-after change that makes keto devotees stop scrolling: the same patient, visibly leaner, with far less visceral fat wrapped around the organs. Lufkin posted the comparison on TikTok on April 19, 2026, asking viewers what differences they noticed and what happened to the visceral fat.

The images are eye-catching, but they are best treated as a visual hook, not the final word. Lufkin’s own profile describes him as a physician, professor, author, and host of Health Longevity Secrets, with metabolic-health content reaching more than 1.2 million people weekly. That reach has made him one of the most visible, and sometimes controversial, voices in the keto and broader metabolic-health conversation. Experts have pushed back on some of his claims about weight loss, diet, high blood pressure, and statins.

What gives the CT comparison real weight is that it lines up with a broader body of research on very-low-calorie ketogenic diets. In a 2016 randomized study of 45 obese patients, the ketogenic group lost more body weight, waist circumference, and body fat mass than the standard low-calorie group over 24 months. The study also found a selective reduction in visceral fat measured by DEXA-based software, with a drop of 600 grams in the ketogenic group compared with 202 grams in the low-calorie group, a difference that was statistically significant.

A 2017 study in the Journal of Clinical Endocrinology & Metabolism pointed in the same direction. In 20 obese patients followed for four months on a very-low-calorie ketogenic diet, average weight loss reached 20.2 kilograms, fat mass fell sharply, visceral fat decreased, and muscle strength was preserved. For keto readers, that combination matters: losing deep abdominal fat without sacrificing strength is one of the diet’s biggest selling points.

Visceral fat is not just a cosmetic issue. It is the fat stored around internal organs, and it is tied to hypertension, dyslipidemia, diabetes, some cancers, and higher cardiovascular mortality. CT and MRI are standard ways to measure it in research and clinical settings, which is why the scans Lufkin posted resonate so strongly. They show the anatomy, while the trials show the pattern: ketogenic diets can reduce visceral fat, but the real question is how much, for whom, and how durable those results are over time.