Nein. Sometimes but not always. Depo Provera in particular suppresses the production of oestrogen and because oestrogen controls the distribution of fat, placing it in the classic feminine places, when it's absent you get fat laid down in places more like where men store it, i.e. belly rather than hips and thighs. Basically it's why women get the middle aged spread when they go through the menopause. But I'm not a menopausal woman dammit and I don't want a belly when I didn't have one before.