Yes, you need a calorie deficit to lose weight. I’m not going to stand here at 50 and pretend otherwise. After over 20 years in clinical practice as a functional Nutritionist….I’ll get it from both sides on this one. The “deficits don’t work after 40” crowd and the “just eat less” crowd. Sharing the SCIENCE anyway. Here’s what neither side tells you. A deficit only moves the scale. Your metabolic health decides whether it feels like a small adjustment or a war. Your blood sugar, your insulin, your cortisol, your sleep. Those decide how hungry you are at 3pm, how hard the cravings hit at 9, and whether what comes off is fat or muscle. So here’s what I do before I ever touch the number. 1. Blood sugar first. Protein and fibre at every meal, breakfast included, so I’m not white-knuckling 3pm. 2. Sleep, at the same time as the blood sugar, because they feed each other. In a 2024 trial, about 80 minutes less sleep a night for six weeks raised fasting insulin, strongest in postmenopau...