Many people can’t understand why they aren’t losing weight when they’re only eating healthy foods. Avocados, nuts, and oatmeal are perfect for us, but they are indeed not low in calories. We may be better off eating 300 calories of oatmeal than 300 calories of cookies, but this doesn’t mean we should eat too much of it. Nutritious or not, portion sizes matter.

Yes, we know we have to control portion sizes when eating cake or ice-cream, but we tend to think this doesn’t apply to ancient grains, fruit and healthy fats. When we load up our plates with healthy foods, like nuts, berries, quinoa and avocados, we need to remember that we’re not eating “empty” calories. Those who battle to stick to reasonable portion sizes may find it helpful to buy portion-controlled packages. Buying mini sizes instead of big tubs also helps keep calories in check.