How many calories should breakfast be?

No rule says breakfast has to be the small meal or the big one. Size it like any other plate, your day over your meals, which is about 500 to 830 calories on a 2,000 calorie day over three meals. The part most breakfasts get wrong is protein, not calories.

Breakfast advice swings between two extremes. One says “breakfast like a king” and the other says skip it and fast until noon. Both have been tested, and the size of breakfast turns out to change less than people think.

In 2019, researchers pooled 13 trials that gave people breakfast or no breakfast. The breakfast eaters ate about 260 more calories a day and weighed slightly more, about 1 pound (0.44 kg). The trials were short and not great quality, so the authors only went as far as saying that adding breakfast “might not be a good strategy for weight loss.” Then in 2022, a trial gave 30 adults with overweight or obesity four weeks of big breakfasts (45% of the day’s calories) and four weeks of big dinners (45% at dinner), with the same total. They lost the same weight. On the big-breakfast weeks they were less hungry.

We’d eat breakfast if you’re hungry in the morning and skip it if you’re not. If you do eat it, make it a real plate with about 30 g of protein. In a 1995 test of 38 foods at the same calories, a croissant kept people the least full of all of them.

A low-protein breakfast is like leaving the house with your phone at 20%. It works for a while, and then you’re looking for a charger by 11.

How do common breakfasts measure up?

For a 170 pound person on 2,000 calories over three meals, the window is 500 to 830 and the protein line is 30 g.

Most of them are small, under 400 calories, and low in protein. The breakfasts that grade well are bigger and built around eggs or Greek yogurt, and only the one with more than 30 g of protein clears the Muscle meter and gets an A. The small ones also fall under half a plate, which the Energy meter counts against them. The 2025 to 2030 US guidelines also tell Americans to cut “ready-to-eat or packaged breakfast options”, which covers most of the low grades in this table.

Does a small breakfast help me lose weight?

Not on its own. Weight follows the day’s total, and the trials above found no advantage either way. What a bigger breakfast seems to change is hunger later in the day, which makes the rest of the day easier.

What to do

• Size breakfast from your day with the plate size calculator, the same as lunch and dinner.
• Build it around protein: eggs, plain Greek yogurt or cottage cheese.
• Add fruit to bring the plants and fiber up.
• Skip it if you’re not hungry, and eat a real lunch.