Yea, but there’s more to it than that. Thyroid causes issues that cause weight to pack on, no matter what your caloric intake is, menopause causing low estrogen causes weight gain because the visceral fat around your organs, the type you can’t exercise off, makes a kinda knock off estrogen, so your body packs on weight, to try and make estrogen there. You could eat one meal a day, all healthy and still put weight on. And there’s so many more health conditions that cause weight gain. Just Genetics, even. The calories in vs calories out theory has been debunked as a singular cause. Sure, if you have no underlying health issues and you watch what you eat, focus on fibre, legumes, vegetables etc, exercise the right amount, you will lose weight, but, if you are able to do that, you are probably already thin. People who are overweight, overwhelmingly have other conditions causing issues, too.