ricecake

Nope. It’s usually people, like in this thread, not understanding what “bad genes” means.

You’re a thermodynamic machine, not magic. If you eat less then you burn you’ll loose weight.
You are also an extremely complicated machine, with complex chemical processes that govern long and short term behaviors.
“You” are a little slice of protein and fat the size of an avocado glued to the front of a more complicated machine. “You” are responsible for solving problems. The rest of your brain and endocrine system is responsible for managing most desires as well as most other things.

Some people have genetics where they run a mile and their body says “oh shit, this would be easier if I turned the energy fountain up to full wouldn’t it?” And now they’re burning more energy when they’re asleep than they were before.
Other people have genetics that gives them a body that says “oh my God, you just ran nearly 2 blocks. Clearly you’re in danger, so I’m going to increase the hormones that tell you to eat a lot more food. Don’t worry, the pizza will be gone before you actually feel how much food that is”.

You can override the endocrine system, but it’s hard. The frontal cortex can change what you do, but the endocrine can change what you want.

Your body is a machine, just like a car. And different cars will start to ding and nag the driver for fuel or maintenance tasks at different points, with different levels of intensity. If your car is built for the Australian outback it might be way more aggressive about fuel warnings, and have a significantly larger tank.

All that’s why excercise is a terrible way to lose weight. You lose weight by getting your eating under control and convincing the medieval peasant in your endocrine system that you’re not in a famine. Excercise makes your body feel better, more capable, and healthier.
You can excercise all you want, but you can eat your way through any excercise routine in minutes.
A peanut butter and jelly sandwich is more than an hour of vigorous time on a rowing machine.