Why your body fights weight loss | Katherine Saunders
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You're listening to TED Talks Daily, where we bring you new ideas to spark your curiosity every day. I'm your host, Elise Hu. Obesity is not a lack of willpower, and there is tons of medical research to back this. In her 2024 talk, obesity physician Catherine Saunders shares the science behind weight, why medications aren't a quick fix, and what it will take to liberate people from the stigma around obesity.

I'm going to tell you something that's going to surprise you. It might be upsetting. And for some of you, it might explain a lot. And maybe I can convince you that it's liberating. Your body is evolutionarily conditioned to gain weight, which means that your body is also evolutionarily conditioned not to lose weight and definitely not to keep weight off.

According to one explanation called the thrifty gene hypothesis, when we were hunter-gatherers, our bodies' powerful anti-starvation responses helped us survive. We had to find our food, and sometimes we couldn't, so our bodies stored calories to keep us alive. The better we stored calories, the better our chance of survival. So what changed? Nowadays,

If we can afford food, there's plenty of it everywhere. We don't have to hunt. Even the gathering is easy. We can order food to be delivered directly to our sofa. And portions are huge compared to even 20 years ago. And a lot of food is tasty, but not so great for us.

We're living in what obesity doctors like me call an obesogenic environment. Limited need for any kind of physical activity and easy access to inexpensive, calorie-rich, nutrient-poor food or food-like substances.

Our bodies primed to keep us alive have gone into overdrive to store all these calories from all of that food just in case.

And this is one of the reasons why we have an obesity epidemic in the United States, where 42% of adults have obesity. And when we take a look at overweight and obesity combined, that number goes up to 74%. Let's go back to the biology part of the equation because it gets worse.

For example, a high-fat diet damages nerve cells in the area of our brain called the hypothalamus, which is like a thermostat regulating how hungry we are and how we use energy. When these nerve cells or neurons become inflamed,

Feedback signals from our guts, our digestive system, and our fat cells can't get through to our brain to tell us to stop eating when we're full and to stop storing calories when we're not at risk of starvation. It literally becomes harder to tell how full we are after eating and how much fat our bodies really need to keep us alive.

Without an accurate thermostat sensor, our bodies store more calories as fat and we're more prone to what we call food noise or persistent thoughts of food, often leading to maladaptive eating behavior. And this is how weight gain leads to weight gain. It's a vicious cycle.

And there are other factors that compound the situation. Some people are even more genetically susceptible to obesity or develop health complications like sleep apnea that can worsen obesity and other health outcomes.

Many people have even less access and ability to afford healthy food. And medications can be a huge culprit with so many common prescriptions and over-the-counter drugs that are weight promoting.

And people with obesity are extremely, extremely likely to experience weight bias, stigma, and discrimination, which can worsen obesity. And I can go on and on about factors other than eating too much and exercising too little that lead to weight gain.

Oh, wait, there's one more thing. When people with obesity try to lose weight, their bodies freak out and think they're starving.

The hunger hormone, ghrelin, increases, and the fullness hormones decrease. It's not your imagination. Every time you diet, your body holds on to calories. Your metabolic rate slows down, and your bodies behave as if you're starving.

This metabolic adaptation is fantastic if, say, you find yourself on a deserted island with nothing but papaya and tree bark to eat. But if your coworker has a bottomless candy bowl, it makes life rough.

So have I convinced you that obesity isn't just a lack of willpower? We know all of this from tons of medical research and rigorously designed scientific studies, but also from the TV show, The Biggest Loser.

If you haven't watched it, The Biggest Loser is a show where people with obesity compete to lose weight. What happens in the show and what we've seen in other studies is that the weight comes back eventually for most people. We know that within two years, half of the weight is regained. And within five years, 80% can be regained.

This doesn't mean that the biggest loser winners are losers. This means that weight loss itself is often a losing battle. In 2017, a patient named Barbara walked into my office. She had given up. She had a lifetime of struggle with her weight. I mean, just some awful, awful treatments and experiences.

Barbara's pediatrician started her on stimulant medications when she was just seven years old. And by the age of 10, her parents had enrolled her in weight washers. Throughout her life, Barbara would lose 100 pounds, regain them, and lose 100 pounds again. And while her weight went up and down, her shame remained constant.

Barbara ultimately underwent a gastric bypass surgery, but after the initial weight loss, the pounds just crept back. It felt like Barbara's body was conspiring against her because it was. And this is when Barbara was referred to me. Barbara presented completely hopeless and blaming her lack of willpower. What else could it be?

I did two things that day that completely transformed Barbara's life. One, I told her, this is not your fault. And two, I gave her hope that I knew exactly what was going on with her body and we had the tools to treat her disease effectively. Barbara had been made to feel her whole life like her weight was her fault when in reality, she has a disease.

Obesity is a disease. And for those who have it, for their complex set of individual reasons, it can be extremely, extremely hard to treat. Does anyone believe it when a clothing label reads one size fits all? No, no, right? Especially when it comes to obesity, of course not. One size fits none.

For some fortunate folks, diet and exercise work. For others, surgery works. But for most people with obesity, effective treatment requires a combination, a personalized combination of more than one treatment approach delivered by a trained care team.

People with obesity should be treated like individuals with any other disease, any other complex chronic disease. An empathetic, reasonable, thoughtful, trained provider assesses each individual patient one by one, understands their version of the disease and

and comes up with a very personalized long-term treatment approach. Obesity medications have absolutely transformed our field. When I started practicing obesity medicine, the most effective medications we had were associated with 5% to 10% total body weight loss, which was still a lot.

But now we can help our patients lose even more weight. And more importantly, much, much more importantly, keep that weight off long term. This new frontier is absolutely astonishing and transformative to our field and to our patients' lives.

But we don't want to fall into a pharmacologic craze and think that the only way to treat obesity is with medication. We have an entire armamentarium of lifestyle interventions, other medications, and other treatment approaches.

Treatment, in fact, in whatever form it takes, should be the last step in the process. The first and maybe the most critical is to finally put an end to the stigma and the shame and the blame and the judgment surrounding obesity.

Understanding obesity as a complex chronic disease that it is, is essential to liberate individuals and to help them actually get the care that they need. Plus, when we accurately appreciate the reality of obesity, this will lead to more innovation and to more treatments.

We're not hunter-gatherers anymore. Well, except we are. Think about the buffet line. Think about the endless snacks in office environments. Our biology drives our brain, our bodies, and our behavior to act as if we're still gathering in a feast or famine environment. Medications are not a quick fix, nor are they the easy way out.

Medications are a tool to help our bodies adapt to our 21st century obesogenic environment. They help quiet the food noise so we can make better food choices, and they give us a fighting chance to take on this terrible adversary once and for all. Thank you.

That was Catherine Saunders at a TED Salon in partnership with Novo Nordisk in 2024. If you're curious about TED's curation, find out more at TED.com slash curation guidelines.

And that's it for today. TED Talks Daily is part of the TED Audio Collective. This episode was produced and edited by our team, Martha Estefanos, Oliver Friedman, Brian Green, Autumn Thompson, and Alejandra Salazar. It was mixed by Christopher Fazi-Bogan. Additional support from Emma Taubner and Daniela Balarezo. I'm Elise Hu. I'll be back tomorrow with a fresh idea for your feed. Thanks for listening.

Tired of the same daily routine? With Peloton, you can transform your day with workouts that adapt to your needs. From chill yoga with mariachi to cardio with reggaeton, there's always something for you, and in Spanish. Whether you're looking to start something new, recharge, or push yourself, Peloton gives you the flexibility to choose between live or on-demand classes from 10 to 60 minutes. Find your push. Find your power with Peloton. Visit onepeloton.com.