Is a bulging belly sapping your summer confidence? The reason for your puffy midsection may be bloat, not fat. To shrink your stomach in less than a week, all it takes are a few simple swaps. Here are 4 foods to add to your diet — and 4 to avoid — for superfast slimming.

1. Add: 2 Kinds of Fiber

Start the day with a better breakfast

Why It Beats Bloat: Constipation distends your belly, and one easy way to get rid of it is by starting each morning with a breakfast cereal that guarantees your body a daily dose of fiber. This gets the digestive system moving within a day or so and keeps it that way. Based on a recent study of breakfast cereals, University of Toronto researchers say that consuming two kinds of fiber at once is most effective. The scientists found that participants had an easier time staying regular with a cereal that contained both insoluble fiber (from bran) and gel-like soluble fiber (from psyllium). The two types work together to pull water into your colon and speed up elimination, explains Joanne Slavin, PhD, a professor of food science and nutrition at the University of Minnesota. The result? You look and feel lighter.

Good Food Fix: Eat 1/3 cup of  Ezekiel 4:9 Organic Sprouted Grain Cereal (Golden Flax) or

Kellogg’s All-Bran Bran Buds each day.

2. Subtract: Sodium

Put down the shaker

Why It Beats Bloat: Sodium makes you retain water, puffing up your belly. Most of us eat more than twice as much sodium as we should–topping 3,400 mg a day, rather than the recommended 1,500, according to the CDC.

Good Strategies: Stop salting your food at the table, and check for sodium on the labels of packaged foods, which provide about three-quarters of our daily intake.

3. Add: Potassium-Rich Foods

Banish bloat with bananas!

Why It Beats Bloat: Foods such as bananas and potatoes help your body get rid of excess water weight, minimizing your middle. The extra fluid is typically present because the two main minerals that control the amount of water in your body—potassium and sodium—have gotten out of balance. When your sodium level is too high, your tissues hold on to fluid. You can restore your sodium-potassium equilibrium by increasing your potassium intake to an optimum 4,700 mg per day. To do this, you need to eat about 4 1/2 cups of produce daily, including the especially rich sources that are mentioned below. As you rebalance your system, you’ll flush out the extra sodium along with the water. Presto: less puffiness.

Watch out, though. Food is a safe source of potassium, but supplements are not. They can cause potassium to build up in your body and potentially lead to abnormal heart rhythms and even heart attack, especially in people with kidney or heart problems, says Leslie Bonci, RD, MPH, director of sports medicine nutrition for the Center for Sports Medicine at the University of Pittsburgh Medical Center.

Good Food Fixes: 1 medium banana, 1 medium papaya, 1/2 cup steamed edamame, 1/2 cup tomato sauce, 1/2 cup cooked spinach, 1 medium orange

4. Subtract: Sugar Alcohols

Watch out for these “diet food” belly busters

Why It Beats Bloat: We don’t completely digest these low-cal sweeteners (found in flavored waters and low-carb, diabetic, and sugar-free foods). Bacteria in the large intestine ferment them, causing gas and even diarrhea.

Good Strategy: Check food labels to help avoid them; common ones are sorbitol, mannitol, xylitol, and lacitol.

5. Add: More Fluids

Guzzle more liquids throughout the day

Why It Beats Bloat: Drinking enough liquid supports the other ways you’re trying to flatten your tummy, says Bonci. For example, she explains, when there’s enough fluid present in your system, the dual-fiber cereal you have eaten is better able to pull liquid into your lower intestine and ease constipation. “Women who don’t drink sufficient fluids can get that blown-up belly feeling, despite all their other efforts to get rid of it,” warns Bonci.

How much fluid do you need? Getting rid of bloat means being well hydrated, so aim for at least 8 glasses of liquid each day, plus plenty of fluid-rich foods, such as fruits and vegetables. You can meet your quota with any liquid, including water, milk, juice, coffee, and tea–though not alcohol, which has a dehydrating effect on your system.

Good Fluid Fix: Tap water is an excellent option because it has no calories, salt, sugar, or additives. And it’s free!

6. Subtract: Candy, Soda, Gum

Avoid these bubble-inducing belly bloaters

Why It Beats Bloat: Once air from any source reaches your digestive system, you experience it as gas and a distended belly. Eating or drinking quickly, sipping through a straw, sucking on hard candy, and chewing gum can make you swallow air.

Good Strategies: When eating, chew slowly with your mouth closed,  Trade carbonated drinks for flat ones, such as juice, green tea or water, and lose the gum and candies.

7. Add: Yogurt with Probiotics

Enjoy this cool, creamy treat for better digestion

Why It Beats Bloat: Research published in Alimentary Pharmacology and Therapeutics reveals that an imbalance of bacteria in your gut can cause your digestive system to slow down and your belly to puff up. However, yogurts that contain live bacteria, otherwise known as probiotics, can help. Though researchers don’t fully understand the mechanism, a study in the Journal of the American Dietetic Associationfound that the bacteria seem to tame tummy bloat by causing an improvement in intestinal mobility, thereby relieving constipation.

Good Food Fix: Eat a daily 4-ounce container of low-fat or fat-free yogurt containing live, active cultures.

8. Subtract: Raw Produce

Cook these foods to shrink your stomach

Why It Beats Bloat: Fresh fruits and vegetables are healthy, but they’re also high-volume foods that take up room in your stomach, distending it.

Good Strategies: Spread fresh produce consumption over the day, so at any sitting you’re not eating more than one-third of the recommended daily total of 4 1/2 cups. You can also shrink produce by cooking it, creating a more compact serving.