Dr. Jason Fung

But you're, you know, very good willpower.

So you only eat 2000 calories.

Well, you still gave the body the instructions to gain that weight.

So even if you eat 2000 calories, your metabolic rate now goes down to 1500 calories.

And you'll still gain that weight.

So I've seen people, because people have measured these things, right?

And I've seen patients who have had, you know, they get this yo-yo dieting because they're sort of calorie obsessed, right?

And they're burning like 800 calories a day.

Their metabolic rate has been pushed down so low because people keep saying to them, well,

Eat 1,500 calories.

You must lose weight, right?

But the problem is that they're eating a lot of ultra-processed foods.

They're spiking their insulin.

They're eating all the time.

So even as they're eating 1,500 calories, they're burning 1,000, 800.

So they're still gaining weight.

They're still gaining like a pound or two pounds.

And people will say, how can you gain weight when you're only eating 1,500 calories?

Because you're burning even less.

And that's the hormones, right?