Whey protein is not recommended for direct consumption by children.
High doses of whey protein can cause side effects such as nausea, thirst, cramps, reduced appetite, tiredness fatigue, and even headache. Moreover, pregnant women as well as breastfeeding moms to be on the safe side should avoid intake of whey protein.
Also, people with kidney diseases or diabetes should avoid consuming it.
Finally, if anyone is allergic to milk, they should avoid Whey protein intake as it is a milk product.