You reduce sugar. You swap white bread for wholegrain. You eat more protein. And yet your energy still crashes at 3pm. Your cravings feel uncontrollable. Your mood dips after meals. If this sounds familiar, you are not failing. The advice may simply not be personalised enough. In this article, we explore why generic guidance does not work for everyone. We will look at individual differences in glucose metabolism, insulin sensitivity, stress responses and gut function, and how