Hello! In the following fill-in-the-gap exercise: " Chocolate can help protect you ... heart disease." the answer key only mentions "against". However, "protect from" is a usual collocation, is it not correct in the context of illness? Thank you.
It is not generally used in the context of protection against developing a disease. As a collocation it is more usually found in sentences such as "Protect your crop from birds by covering it with netting" or "It helps to protect the skin from the effects of the sun".