In people using progestin-only contraceptives, most studies do not show an increase in weight or body fat, but some do show a small increase (11). Some people will gain weight on birth control, and some people may be more prone to weight gain than others.

Can progestin help with weight loss?

In all these effects note that progesterone does not directly cause weight loss. Instead it reduces the effect of other hormones in the body which are causing the weight gain. Think of it as allowing rather than causing the body to lose weight.

What does progestin do to your body?

What Does Progestin Do? Progestins were created to bind to progesterone receptors in the body and create similar effects as progesterone. Progestin can change the lining of the uterus and stop the lining from building up. Scientists made progestin because progesterone isn't absorbed well when taken as a pill.