Dr. Jason Fung

However, if you eat the wrong foods and you're eating all the time, so you're eating 10 times a day, eight times a day, like people say you should, you're eating low fats or you're eating tons of carbs, you're spiking your insulin.

Insulin prevents you from burning body fat, okay?

So again, we've known about this for 80 years.

So now you eat 1500 calories, but you're keeping your insulin levels really high.

So fewer calories, but lots of high carb foods, eating all the time, insulin stays high.

You're taking in 1500,

Your body is now burning 2000, but you can't burn any body fat.

So the calories that are stored in your body fat cannot be sort of taken out.

It's like it's in the bank and the bank is closed.

You can't take it out.

So what's gonna happen?

Well, you don't have a balanced equation.

So that cannot happen.

So what happens is that in order to balance that equation, because your insulin levels are high, you're eating 1500 calories coming in, your body can only burn 1500 calories.

Your metabolic rate has just now gone down by 500 calories.

And guess what?

You're not losing any body fat.

So that's an example of how the calories idea is completely wrong.

Because if you continue to do that, what's going to happen over time is that you get tired because you're burning fewer calories.

You don't have enough energy to generate body heat.