How cutting out food groups can backfire

HostA lot of people I know are trying to fix how they eat by just crossing things off a list. They say they're going clean, so they stop eating bread, or they cut out all fat, or they skip fruit because of the sugar. It feels like they're finally taking charge of their health, but after a few weeks, I usually see them crash and burn. Why is it that these big, strict changes seem to fail so often?

GuestIt's a huge trend, but it often ignores how our brains and bodies are built to work. When you tell yourself you can never have a certain food again, your brain doesn't just forget about it. It starts to fixate. Think of it like a spring you're pushing down with your hand. You can hold it there for a while, maybe a week or two, but the harder you push, the more that spring wants to push back. Eventually, your hand gets tired, you let go, and that spring flies across the room. In food terms, that's often a binge. You don't just have one slice of toast; you eat the whole loaf because your brain is in a panic. It thinks it's being starved of something it needs, so it goes into a high state of alert to get as much as it can while it has the chance.

HostSo it's less about being weak and more about the brain just taking over? I always thought people just needed more grit to stick with the plan.

GuestGrit only goes so far when you're fighting your own biology. Your body has these deep, old systems to keep you alive. One of those is how it uses fuel. Take carbs, for example. People treat them like the enemy now, but your brain is a total fuel hog. It uses a massive share of the energy in your blood. When you cut them out entirely to eat clean, you're not just losing weight, you're starving your head. That's where that thick brain fog comes from, where you can't remember a name or finish a simple thought. You think you're being healthy, but you're really just running on empty. It's like trying to drive a car with no gas and wondering why the engine is stalling. You feel tired, snappy, and slow because your brain is trying to save energy.

HostBut wait, a lot of people say they feel amazing the first week they cut out bread or dairy. Their stomach feels flatter and they have all this new energy. Is that just a lie?

GuestNot at all, but it's usually a bit of a trick. When you cut out a whole food group like carbs, your body lets go of a lot of water. That's why the scale drops fast and your clothes feel loose. You feel light and proud, which gives you a rush of good feelings. We call this the honeymoon phase. But that fast weight loss slows down, and the lack of fuel starts to catch up with you. That's when the mood swings and the hunger hit. And there's another hidden cost in your gut. Inside you, there's a whole world of trillions of tiny bugs that help you stay well. These gut bugs are picky eaters. Some only eat the fiber in beans, others like the bits in oats or fruit. If you stop eating those things, those specific bugs start to die off. You end up with a very thin, very weak group of bugs in your belly. That makes it harder to break down any food and can even make you feel down or anxious.

HostThat sounds like a big trade-off just to follow a rule. And I imagine those rules make life pretty hard when you're not in your own kitchen.

GuestThat's the social side of the trap. If you can only eat five or six things, you can't go to a friend’s house for dinner without a big plan. You can't just grab a snack when you're out for a walk. You're always on high alert, checking labels and worrying about a hidden ingredient that might ruin your streak. That constant state of worry raises your stress levels. And we know that high stress makes your body hold onto weight and makes you feel worse overall. So the very thing you're doing to get healthy is putting your body under a different kind of pressure. You become afraid of food instead of fueled by it.

HostIt seems like we're traded one kind of bad feeling for another, all in the name of being clean.

GuestExactly, and the more you narrow down what you eat, the more likely you're to miss out on the tiny bits of minerals and vitamins that keep your heart and skin healthy. Variety isn't just a nice thing to have; it's a shield for your health. When you eat a bit of everything, you cover all your bases without even trying. The most successful way to eat is usually the one that doesn't feel like a fight every single day.

HostThe strongest sign of a healthy way to eat might be that you hardly have to think about it at all.

GuestThat bread on the table isn't a test of your character; it's just fuel that your brain and your gut bugs are waiting for.

HostThe kitchen table should be a place where we sit down to fill up, not a place where we sit down to lose a fight with a list of rules.