I have been playing fitness for 3 years, and I also eat protein powder. But I want to remind you that if you just want to keep fit, there is no need to eat more beef. Fish. Wouldn't eggs be better as natural substitutes? Protein powder intake is very important. If you eat too much, you can increase the burden on your kidneys according to the amount of exercise. It's like it's the same reason that you only eat and don't exercise and gain weight. I hope it helps you. The most important thing in fitness is to have a good rest and stick to it.