1. Eat more magnesium-rich foods.iStock/Thinkstock
Magnesium deficiency is linked to obesity and inflammation. The 21-Day Tummy diet loads up on spinach, brown rice, and pumpkin seeds, among other whole foods, to provide more of this vital mineral.
More: 7 Best Foods for Your Belly »
2. Eat more anti-inflammatory fats.iStock/Thinkstock
Pair the MUFAs in foods like dark chocolate, olives and avocados that specifically target visceral belly fat with omega-3s (found in foods like salmon and walnuts) that combat inflammation and the many diseases associated with it. This protects you from heart disease, depression, type 2 diabetes, stroke, cancer, and, of course, gastrointestinal disorders and weight gain.
Also: 7 Worst Foods for Your Belly » .
3. Eat fewer carb-dense foods.iStock/Thinkstock
Carb-dense foods can alter the balance of our gut flora, triggering inflammation. Foods are considered carb-dense if they have a high ratio of carb grams relative to their weight. To minimize carb-dense foods, the 21-Day Tummy diet cuts out sugar, refined carbs, and most grains. Instead, it adds carb-light, natural foods like bananas, potatoes, and leafy green vegetables. Lean proteins and healthy fats are also carb-light.
More: How bad are your digestion problems?
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4. Eat fewer FODMAPs.iStock/Thinkstock
Clear your system of FODMAPs, the rapidly fermentable carbs or sugars that can play an ugly role in your digestive system, causing gas, bloating, diarrhea, and constipation. Everything from the fructose in agave nectar to the lactose in milk can be fast food for the bacteria in your gut, which is bad news for those of us with sensitive stomachs. The 21-Day Tummy diet minimizes FODMAPs, then guides you through a test to see which ones you can tolerate after three weeks.
Also: 6 recipes to lose weight and help digestion »