Peterson has his clients work up to holding a plank for 1 minute. Then they progress to performing vacuums during the exercise: Suck in your abs like you’re trying to button jeans that are too tight. Hold for 3 counts, then release for 3 counts. Repeat until the end of your plank. You’ll have to build back up to a minute, but it’s worth it, Peterson says.
That's exactly what happened when last summer I shared Zero Belly Diet with a test panel of more than 500 people, some of whom lost as much as 16 pounds in just 14 days, and up to three inches off their waist. The secret to Zero Belly Diet is the new science of nutritional genetics, the study of how our genes are turned on and off by the foods we eat. Simply making a handful of tweaks to your diet and lifestyle can help improve your gut health, dampen inflammation, turn off your fat genes and start your body shedding fat—in particular, belly fat—almost automatically.
What causes it? Your genes, for one thing. "Some families just carry most of their weight in their bellies, no matter how thin they are," says Caroline Cederquist, M.D., author of The MD Factor Diet. But visceral fat gets worse for all of us as we get older, especially if we're under a lot of stress or not sleeping well, says nutritionist Sara Vance, author of The Perfect Metabolism Plan. That's thanks to hormones that make us hungrier even as our bodies are practically hoarding fat.