You've heard it before, but it needs to be said again, as at least 70 percent of Americans aren't listening: "Staying up late may make you happy in the moment, but all that sleep you're skipping catches up to you in the form of extra fat around your middle," says Ilyse Schapiro, R.D., a certified nutritionist and co-author of Should I Scoop Out My Bagel? Yes, "me time" is important for your sanity, but "when you're lacking sleep, your body overproduces the appetite-stimulating hormone ghrelin, and under-produces leptin, which tells you when you're full." Getting proper shut-eye — the National Sleep Foundation says seven to nine hours is best, though it varies per person — truly stops unnecessary snacking when you wake up the next day.
Saturated fats in food will pack on more visceral fat than polyunsaturated ones, according to a 2014 Swedish study. When subjects ate 750 more calories daily for seven weeks, either in the form of palm oil (saturated) or sunflower oil (polyunsaturated), the former gained more visceral fat while the latter gained more muscle mass and less body fat. The study authors believe different fat types can impact both the way your body forms fat and stores it. What’s more, including healthy fats in your meals can make them more satiating and keeps hunger at bay.
The most important thing you need to do is to program yourself mentally. Don't use a scale to measure your progress. If you work out with weights, you may gain a few pounds while losing inches around the waist. Instead, use that pair of jeans that you want to fit into again, or a pair that fits you now. You'll see a slight change every few weeks, and that should give you confidence.
Belly fat also responds to a lower-calorie diet that's full of healthy, unprocessed foods. Go for lean protein, fresh produce and whole grains at meals. When you have just a week to lose as much as possible, ban all sweetened drinks -- including soda and juice -- bakery treats and ice cream. Also avoid refined grains, such as pizza and white bread, as well as alcohol. Keep your portion sizes to just 2 to 4 ounces for meats and other proteins and about 1/2 cup for grains. Over the long term, these dietary revisions help you drop belly fat.
High-intensity interval training is high on every trainer’s list, and for good reason. “My No.1 pick for fat loss would be high-intensity interval training, just because you’re burning a lot of calories in a short amount of time. You’re getting more bang for your buck. I know a lot of guys that don’t have all day to work out in a gym, so when it comes to belly fat you have to focus on calorie burn and intense workouts,” says Jim White, owner of Jim White Fitness and Nutrition Studios in Virginia Beach. Think bootcamps, tabata, and series of burpees, box jumps, and sprints—those all do the trick. The best thing about HIIT is that it keeps your body working long after you leave the gym, burning calories and fat on your off hours via a phenomenon called excess post-exercise oxygen consumption, aka EPOC.
With potatoes, leave the skin on (with baked or mashed potatoes) or if you peel them, make snacks of them. For example, drizzle olive oil, rosemary, salt, and garlic on the peels and bake at 400 F (205 C) for fifteen minutes for baked Parmesan garlic peels. Keeping the skin on potatoes when cooking them helps keep more vitamins/minerals in the flesh (just don't eat any parts of skin that are green).
In a 2012 study in the journal Obesity, subjects who increased their soluble fiber intake by 10 grams a day—the equivalent of two small apples, one cup of green peas, and one half-cup of pinto beans—reduced visceral fat by 3.7 percent after five years. Even more, participants who also engaged in moderate physical activity (exercising vigorously two to four times a week) experienced a 7.4 decrease in visceral fat over the same period of time.