For years, American nutrition guidance has been generally applied: Drink water, limit your intake of added sugars, try to eat a balanced diet.
But that guidance has never been able to take into account how drastically different individual responses are to what we eat, says Pennington Biomedical Research Center clinical science professor Leanne Redman, who's working on the new study.
"Even when you provide people the same exact diet, the exact number of calories and carbohydrates, vitamins, proteins and minerals, we still see a wide variation in how people respond," she says.