My Thoughts On The Biggest Loser Documentary

Uncategorized Oct 16, 2026

Did you watch the Netflix documentary on The Biggest Loser?

I did this week. And it unlocked so many core memories as a Xennial growing up in the 1990s and early 2000s.

I remembered all the diets, from Atkins to SlimFast, the latter being my personal gateway into the insane world of fad diets at the time.

I remembered the tabloid magazines that bullied actresses for their cellulite and then shamed them for developing eating disorders.

I remembered the increased pressure to look like Kate Moss while food became more and more processed and less and less recognizable.

We started seeing a rise in obesity across the nation even though the harder people dieted, the more weight they ended up re-gaining.

Every adult woman I knew was on a diet. I thought that looked miserable, so I just ate like all the guys around me (and overate... a lot!).

But I digress. The important thing to know here is that this was the vibe around the time that The Biggest Loser came about.

Gen Z would be horrified if this show were live on air today!

A show that validated the consensus at the time: that losing as much weight as possible, as fast as possible, was the ultimate success.

There wasn’t much discussion of method, sustainability, or muscle preservation, besides a controversial Doctor trying to ethically manage the extreme approaches for each contestant, but who was largely ignored by the trainers.

And for 17 seasons, it looked like it worked. Contestants lost staggering amounts of weight and the transformations were dramatic year after year.

But what happened after the cameras turned off reveals the biggest takeaways.

Most of the contestants gained back the weight they had lost, some of them hundreds of pounds.

And years later when researchers followed up with these individuals, they discovered something shocking:

Not only did most people regain the weight...
but their resting metabolic rate remained suppressed.

In other words, even though they were heavier again, their bodies were burning fewer calories than someone else at the same size.

Normally, the more weight you carry, the more calories you burn. But because of how extreme and fast their weight loss had been, with no transition plan in place to build back up their metabolism, their bodies never recalibrated.

This is why quick fixes are so problematic. They are not just unsustainable.

They can actually leave your metabolism and hormones worse off than before, requiring sometimes years to fix.

Let's breakdown the main reasons in greater detail about why The Biggest Loser approach failed and what it teaches us about lasting change:

1. Extreme exercise and fad diets aren't sustainable.

Contestants were exercising up to six hours a day while eating very low calories compared to how much they ate before the show.

That combination was impossible for most to maintain once they returned to real life. From taking care of kids, to running a house to working again, the contestants found themselves also returning to old habits such as binge eating and buying processed food.

Although their bodies adapted to the initial restriction, rebound weight gain inevitably followed after their food intake increased.

Takeaway: you need a plan that is not only sustainable but you also need an “exit strategy” after any targeted fat loss phase.

2. Their metabolism slowed and never fully recovered.

Studies showed that years later, contestants’ metabolic rate was lower than expected.

They were burning hundreds of calories fewer per day than someone else at the same size.

This is one reason why many found it nearly impossible to keep the weight off and many became heavier than when they first started.

Takeaway: metabolic adaptation is a real thing, which is why weight loss is done best slowly with a focus on retaining muscle mass and eating sufficient protein.

3. Hormones could not keep up.

Ghrelin and leptin are two hormones that help regulate hunger and fullness. They are designed to adapt slowly over time.

But repeated cycles of extreme weight loss and regain can cause leptin resistance.

Similar to insulin resistance, the hormone leptin no longer functions properly. When this happens, the brain thinks you don’t have enough body fat, so it drives up hunger and lowers calorie burn.

This creates long-term confusion in appetite regulation and energy expenditure.

P.S. if you already have insulin resistance (which is common for those with prediabetes and diabetes), you are also leptin resistant. And leptin is largely a circadian hormone. Reply back to this email if you'd like to learn more : )

Takeaway: Slow, sustainable change protects your hormones. It helps leptin and ghrelin regulate properly so you can lose body fat and keep it off.