Photo by DIAO DARIUS on Unsplash

Insulin Vs. Calories —Which controls the Body Fat Thermostat?

I’ve read hundreds of weight loss studies and this is one of my favorites. Controlling the Body Fat Thermostat — Part 9

Dr. Jason Fung
9 min readMar 13, 2024

--

There is a saying — ‘a calorie is a calorie’. This usually implies that all calories are equally fattening.

It’s sneaky to say this because obviously a calorie is a calorie, just as a dog is a dog, but it is not at all obvious that all calories are equally fattening. 100 calories of cookies and 100 calories of broccoli have the same calories. Are they therefore equally fattening? The fact that the cookies will stimulate completely different hormones than the broccoli is considered irrelevant.

Suppose you eat 100 calories of cookies vs 100 calories of broccoli.

Are the hormonal responses completely different? Yes. This is a well-established fact.

Do different hormones affect body fat differently? Yes. This is a well-established fact.

Therefore — why would anybody with even a tiny brain think that all calories are equally fattening?

What confuses the issue is that there is a major overlap between calories, which is the physical energy contained within a food, and insulin, which is a hormone…

--

--

Dr. Jason Fung

Nephrologist. New York Times best selling author. Interest in type 2 diabetes reversal and intermittent fasting. Founder www.TheFastingMethod.com.