It's not just a woman thing unfortunately, this is a symptom of Modern Civilization.
We aren't meant to be living like this, spending most of our time sitting and having an incredible abundance of food. Before industrialization, we didn't have a strong enough food surplus such that people can consistently consume more calories than they burn. People had to sweat for food supply.
Now, you can get a Mcdonald's cheeseburger for about $1, literally less than ten minutes of working at minimum wage. Literally 263 calories for walking around a store.
Managing weight is not an easy thing. Our diets and the way most people live make it really easy for people to gain weight. Dieting and doing enough physical exercise takes a lot of willpower in the Modern era, and most people would rather not have to deal with that.