"We have previously had two well-established types of magnetism," study author Oliver Amin, a postdoctoral researcher at the University of Nottingham in the U.K., told Live Science ...

Protein should make up 10% to 30%, and fat 20% to 35%. The term “calorie density” describes the number of calories in a food relative to its weight, usually per 3.5 ounces (oz) or 100 g.