Some people can lose more than 2 pounds in a week with a dedicated fitness program and serious dietary restrictions.The time and effort required to lose weight that quickly is grueling and usually unsustainable, though. Even if you can lose a notable amount of weight in a week, a lot of it will be water weight -- not true belly fat. Weight you lose quickly is likely to be regained quickly too.
Canned tuna could be your solution to a flatter belly — and it'll only cost you around 80 cents a pop. "Canned tuna — as well as other fish — is an excellent source of omega-3 fatty acids," Taub-Dix days. "Besides promoting heart health, omega-3s help you ditch pounds by keeping you feeling satisfied while repairing and replenishing muscles." Win-win, much? Instead of making tuna salad with fatty mayo, try Greek yogurt instead. The mix makes the perfect filling for a healthy lettuce wrap or stuffed into an avocado half.

People with chronically high levels of the stress hormone cortisol tend to carry excess visceral fat. Foods that are high on the glycemic index (GI), which uses a ranking system of 0 to 100, cause more rapid spikes in your blood sugar, in turn triggering the release of cortisol when glucose levels crash. The constant up and down of your blood sugar levels can also lead to insulin resistance — the first step on the road to type 2 diabetes. To help keep cortisol levels stable, choose low-GI foods (with a rating of 55 or less) like beans, lentils, and chickpeas, instead of high-GI options like white rice and potatoes. To find the GI rating of your foods, use the University of Sydney’s database at glycemicindex.com.
You know that choosing the right types of fats is key, and here's why: Unhealthy fats, found in processed foods, meats, and cheeses, feed the type of bacteria that spark inflammation and cue your body to store fat, says Lipman. But healthy fats high in omega 3s and 6s — like those in avocado, nuts, olive oil, and salmon — do the opposite. They provide long-burning energy by regulating how quickly glucose enters your cells, keeping hunger at bay. Top a sandwich with mashed avocado, or make a summery side salad with chopped avocado, cherry tomatoes, basil, and lemon juice.
They may not be totally mainstream yet, but there's good reason to incorporate marine gems like nori, hijiki, wakame, arame, and kombu into your regular diet. "With omega-3 fatty acids not found in other plant foods, sea vegetables (or seaweed) are inflammation fighting powerhouses," says St.John. "Omega-3 fatty acids are potent inflammation-fighters, so sea vegetables can enhance your body's ability to suppress inflammation and may lead to a flatter belly." Note: Store-bought seaweed snacks can pack a lot of sodium (which can contribute to bloat), so be sure to scan nutrition labels before purchasing.
Remember that it takes a 3500-calorie deficit to lose one pound of fat. That is, you have to either burn off 3500 calories through exercise or eat 3500 calories less than you burn in a week. Break this up into daily limits. To burn 3500 calories a week, you should aim to have a 500 calorie deficit every day. For example, you can exercise to burn 250 calories and cut 250 calories from your diet.
"Crash diets (dramatically cutting down how much you eat) might help you to lose a few pounds at first, but they’re hard to sustain and won’t help you keep the weight off. It might seem like a quick and easy option, but eating too few calories can actually do more harm than good. If your calorie intake dips too low, your body could go into starvation mode. This will slow down your metabolism, making it harder for your body to lose weight. Make sensible, healthy changes to your lifestyle that you can stick to and avoid the fad diets."

Whether you fill up using the K-cup version or make a batch in your slow cooker, Kellyann Petrucci, M.S., weight loss expert and author of Dr. Kellyann's Bone Broth Diet, says it's important to drink up if you want to lose weight. "Doctors now know that inflammation is one of the biggest culprits of weight gain, so anything with as much gelatin (or collagen) as bone broth will help soothe your gut and get it rebalanced," she says. How? After a bone has melted into a broth, it's loaded with powerful anti-inflammatory nutrients, she says. Not to mention it's in soup form, which studies show helps you cut down on portion sizes, and it's filling, so you're less likely to crave not-so-healthy snacks later.

If you have a big-time sweet tooth, grabbing a grapefruit could help cut back on calories from late-night treats. "The interesting thing about grapefruit, and citrus fruits in general, is that they provide an intense, satisfying flavor that rarely gets chanced by sweets," Taub-Dix says. "A grapefruit or citrus fruit after dinner could keep you from reaching for a sweet dessert." Yeah, that's right: a 52-calorie grapefruit can satisfy just as much as a 400-calorie piece of chocolate cake. Sorry, brain, but you just got played.
“Include lots of nutrient-rich vegetables, a source of protein and some healthy, unprocessed carbs,” says Belalij. “Start with leafy greens such as spinach, kale and collard greens, then add carrots, broccoli and peas. Lean meats, including turkey and chicken, are ideal as they are lower in fat and therefore calories, or, if you are vegetarian/vegan, add in tofu or a handful of nuts such as pine, cashew or almonds and a sprinkling of seeds (sunflower, sesame, pumpkin). When it comes to carbohydrates, rice, quinoa and potatoes are perfect.”
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