Oct 29, 2026 · 19 min · 19 segments
Calorie Deficit For Weight Loss | What Is Calorie Deficit | Jason Fung 💪 A deep dive into the science of cutting calories for weight loss. We explore the scientific evidence and strategies behind…
Jason FungHost
There are so many experts, often with fancy academic titles and so on, that says weight loss always comes down to eating fewer calories.

That is to say, if we believe that somebody can just eat fewer calories and lose weight, and it doesn't really matter what those calories are.

As long as it's the same number of calories, then, and you're cutting them, then you should lose weight.

So let's list all of the top randomized controlled trials that have shown the benefit of weight loss when you simply cut your calories, as all these experts say.

There have been exactly zero studies that show that if you simply cut 500 or 600 calories per day, you will lose weight over the long term.

In a classic textbook called Jocelyn's Diabetes Melodist in 2005, they said that reduction of caloric intake is the cornerstone of any therapy for obesity.

However, they also go on to mention that both low calorie diets and very low calorie diets, none of these approaches has any proven merit.

There are so many experts, often with fancy academic titles and so on, that says weight loss always comes down to eating fewer calories.

That is to say, if we believe that somebody can just eat fewer calories and lose weight, and it doesn't really matter what those calories are.

As long as it's the same number of calories, then, and you're cutting them, then you should lose weight.

So let's list all of the top randomized controlled trials that have shown the benefit of weight loss when you simply cut your calories, as all these experts say.

There have been exactly zero studies that show that if you simply cut 500 or 600 calories per day, you will lose weight over the long term.

In a classic textbook called Jocelyn's Diabetes Melodist in 2005, they said that reduction of caloric intake is the cornerstone of any therapy for obesity.

However, they also go on to mention that both low calorie diets and very low calorie diets, none of these approaches has any proven merit.
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