Skipping the toast might matter more than what's actually on your plate

Is breakfast the most important meal of the day, or the easiest one to skip? Benjamin Bikman's answer isn't a simple yes or no, and the reason has to do with something happening in your body before you've eaten anything at all.

Even on a full night's sleep, insulin naturally starts climbing around 5:30 in the morning and stays elevated for a couple of hours, a pattern researchers call the dawn phenomenon. This isn't a sign of a problem; it's the body responding to hormones like cortisol and growth hormone that rise overnight to prepare you for the day, and those hormones push blood sugar up, which forces insulin to work harder than it will later. One controlled study found that the same glucose drink triggered the highest insulin response in the morning and the lowest in the evening. Translated into food terms, Bikman notes, a piece of toast eaten at seven in the morning demands more insulin than the identical piece of toast eaten at seven at night.

So does skipping breakfast help? The research is genuinely mixed. One study of obese women found that those who ate breakfast lost slightly more weight than those who skipped it, while a larger study following almost 300 overweight men and women for four months found no difference at all between skippers and eaters. Bikman's resolution to this contradiction is straightforward: it depends entirely on what's being eaten. Breakfast, more than any other meal, tends to be built almost entirely around sugar and starch, cereal, juice, bagels, toast. Eating that kind of meal during the exact window when the body needs the least help handling carbohydrates is close to the worst possible timing.

There's a second layer to this. Fat tissue runs on its own clock, and it happens to be most sensitive to insulin in the morning and least sensitive in the evening. Since insulin blocks fat burning and encourages fat storage, an insulin-spiking breakfast may add more body fat than the same food eaten later in the day would.

Try pushing your first meal later on some mornings, since breakfast is usually the easiest meal to skip without affecting anyone else's schedule. On the mornings you do eat, lean toward eggs, avocado, or full-fat yogurt instead of cereal, juice, or toast, which ask the most of a morning insulin response that's already working overtime. Save rice, pasta, or bread for later in the day when they place less demand on the system, and spend a few days simply noticing how much of your usual breakfast is really just sugar and starch in disguise. Once you see it clearly, the choice of what to change gets a lot easier.