What wasn’t widely known at the time is just how important protein is for muscle repair, feeling satisfied after meals, energy production, and blood sugar control. If you’re a sedentary adult, aim for 1 g of protein for every kilogram you weigh. If you’re over the age of 65, make it 1.2 g to 1.5 g for every kilogram you weigh. Yes, although you would need to be eating a concerning amount of protein for it to become unsafe. The most likely side effects of eating too much protein are usually bloating, digestive discomfort, constipation, excessive or increased thirst, or a lack of energy.