Eating protein will not make you fat. Don't worry, I also do fitness. The best time to eat protein powder is 20 to 30 minutes after your fitness, because after your fitness, your whole body muscles are hungry in protein, so supplementing protein is the best time to absorb it. For our fitness, protein powder generally recommends eating animal protein (like whey protein) instead of plant protein (like soybean protein). Because animal protein is easier to absorb and it is not easy to accumulate fat.