advise (someone) against (something)
to suggest that something should not be done
I advised my friend not to swim in the river.
Benefits of Oranges
Prevents hair loss
Orange has high Vitamin C content which is required for producing collagen which, in turn, is responsible for keeping the tissues in your hair together. Nobody likes bald patches on their head, and eating oranges can ensure that you do not have to part with your lovely hair as you grow older.