Hello! as to why some women gain weight when they go on hormonal birth control?
I’m a big fitness person and believe that calories in v calories out is what makes you put on weight. If someone is still working out and their diet hasn’t changed but they began hormonal birth control, why are they putting on weight? How does this happen?
I’m genuinely curious and would love some insight. Thank you.
In: Biology
“Weight gain is due to excess calorie intake” is an oversimplification. It’s true, more or less, but it doesn’t capture the nuances of nutrition and the human body. Even my explanation below isn’t close to complete, just focused on resolving your question.
So let’s start with the absolute basics. Why do you eat? Overthink it and you might say that you eat because your body needs food to function, but that’s too far removed from the question. I didn’t ask why humans eat, I asked why *you* eat. And the answer to that is obvious: because you’re hungry.
Question number two: Why are you hungry? Because the balance of chemicals in your body has shifted, and your stomach and brain interpret that to mean you need food. Maybe even a certain type of food. And as you build habits in both what and how you eat, your body responds by adjusting its baseline. Eat an apple and you’ll feel more “full” than if you eat the equivalent volume in Jolly Ranchers. And after that apple, you’ll take longer to feel hungry again. But with the candy, not only will you feel hungry sooner, you’re training your body to *expect* that rapid infusion of calories. Do it often enough and you’ll have a physiological urge to eat more sweets. Its habit forming. Literally. And it’s driven by your body’s hormones.
Question the third: How are those calories stored in your body? Obviously there’s a division between fat and muscle, but how does your body decide which to build and where? Cardio to burn calories. Weights to build muscle. Sit on your ass to get fat. But how does your body know when to do each one? Again, hormonal signals drive the response. Someone with more of one hormone might add muscle mass more quickly than someone with less of it, even if you’re working out the same amount. And between those two people, the excess calories go to fat. Is it subcutaneous or visceral fat (under the skin or around the organs)? Hormones drive it.
Question IV: Now that we know why you’re eating a lot, and choosing unhealthy foods when you do… why don’t you burn it off with exercise? Well once again, hormonal cues can affect how active a person is. Are you sitting still when you’re sitting down, or moving around? When you have free time, do you feel like moving or relaxing? Like with eating, it’s easy to say that you can “choose” one or the other, but your body has a lot of weight on the scale (heh). You might *know* that exercising is good for you, but knowing something doesn’t necessarily translate to action. Again, hormones can push you one way or the other. Building up good habits helps regulate those hormones and prompt you to keep it up, but that can go haywire because of how we answer…
The final question: How does birth control work? It shifts the balance of hormones in your body. Shifting that balance can, depending on what you’re taking and how your body accepts it, affect your hunger, what you’re hungry for, how your body processes that food, where it stores fat, and your own baseline energy levels. Shift the levers wrong and you’ll gain weight.
*Can* you stay skinny despite all that? Sure. It’s just a whole lot harder, and the people shouting “calories in:calories out” are making things harder by ignoring how the human body actually functions. It’s not a simple machine with a fuel gauge and a meter to measure output. People struggling with weight aren’t having issues with *math*.
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