Estrogen and testosterone rise till they peak: Careful, Week 2 gal: You’re more likely to overindulge in alcohol, food, shopping and anything else that gives you pleasure, but could be bad for you. The reason? As estrogen climbs, it gives your brain a bigger euphoric buzz from fun yet naughty stuff, so once you start partaking, it can be hard to stop. Find out more by downloading the Hormone Horoscope App.