1) One of the ways to curb frequent hunger are to eat protein rich diet.
2) One of the way to curb frequent hunger is to eat protein rich diet.
3) One of the ways to curb frequent hunger is to eat protein rich diet.
4) One of the ways to curb frequent hunger are to eat protein rich diet.
5) Both 3) and 4)
Rule 13 (a): In sentences containing the words one of or one of the in simple form, a singular verb is used. So, for ‘One of the ways’, verb ‘is’ will be used.