evidence: Oatmeal is a classic breakfast. And if you’ve gotten the impression that it’s a plain and boring meal that is only carbs, think again. Make it right, and you can have a well-balanced bowl of oats that contains the right amount of carbohydrates, protein, and fat, which will keep you full and satisfied till lunchtime. Oh, and, you’ll want to make it delicious. [...] One of many essential healthy oatmeal tips: Keep portion size in mind. One cup of cooked oatmeal is a healthy serving size, says Jessica Crandall Snyder, RDN, CDCES, the CEO of Vital RD in Centennial, Colorado. That amount will contain 154 calories, 27 grams (g) of carbs, and 4 g of fiber, according to the U.S. Department of Agriculture (USDA).