There are healthy belly bacteria, and then there are bad belly bacteria, the later of which studies indicate overweight people have more of in their gut. To keep the fat-causing bugs at bay, you need to eat a variety of foods that support their healthy counterparts—the kind found in the bellies of slim people. Examples of probiotic-rich foods that help you lose weight by aiding digestion include kefir, kombucha, and yogurt.
Whatever the product, workout, or service is, they are trying to sell you quick fixes for a flat stomach that will not get you a flat stomach quickly. That is, unless you also make another BIG change, which is what Saint from the NF community focused on to get to the above results (without any ab product, routine, or service), but I’ll get to that shortly!

Your body needs some sodium to function, but too much can lead to fluid retention in the gut, Henderiks says. Put down the shaker and forgo processed and prepared foods as much as possible in favor of homemade meals so you can control the salt. Experts recommend maxing out at 2,400 milligrams of sodium a day, but this is one time when less is better.
According to a study published in Bioscience, Biotechnology, & Biochemistry, consuming apple cider vinegar each day can lead to weight loss, reduced belly fat, waist circumference, and lower blood triglycerides. More specifically, the study of obese Japanese participants found that those who consumed 1 tablespoon of ACV over a three month period lost 2.6 pounds, and those who consumed 2 tablespoons lost 3.7 pounds in the same time frame. Toss a spoonful of ACV into a homemade salad dressing or smoothie and watch the weight melt off!

Crunches address your abdominal muscles, but you also need to do exercises to hit the other major muscle groups including the legs, hips, shoulders, chest, back and arms. At least one set of eight to 12 repetitions of exercises for all of these muscle groups -- including crunches -- completes a total body routine and will help tone your stomach area faster than crunches alone. Once you can do that without getting too tired, repeat each exercise set two or three times, or make them harder by adding weight. The important thing is to continue challenging your body if you want to see continued improvement.
Honestly, children and young teens shouldn't push themselves too hard, however, if desperate try drinking cold iced water before every meal (helps lose excess fat), eating smaller portions, and doing 10-30 minutes of exercise in the morning. Also, leisure activities like swimming are great for working abs and the rest of your body at the same time.
UPDATE (1/16/17)...I initially gave this a 4/5 thinking it was sound, smart advice, but 13 months later, after reading a number of nutrition books, I've come to understand a lot of the bad advice given in this book. While there are some good points on antibiotics, the advice and justification of Whole Grains are terrible (frankly, I dismiss anyone's nutritional advice when they say you need to eat whole grains; whole grains suck; see Wheat Belly or Undoctored by William Davis and/or Eat the Yolk ...more
Replace your candy and cookie jars on the kitchen counter with a bowl of fresh fruits and containers of nuts. Stock your fridge with chopped veggies and hummus for a quick and healthy snack. This way they’re more readily available, and you have no excuses to grab a bag of chips, right?  Katie Cavuto, MS, RD, the dietitian to the Philadelphia Phillies and Flyers, likes having washed and prepared cucumbers, peppers, sugar snap peas, and carrots in the front of the fridge so they aren’t overlooked. Bananas, apples, pears and oranges fare well as sweet snacks and should be kept on the counter where you can see them. To discover more healthy foods that will help you lose weight, check out these 25 Best Foods for a Toned Body.
It’s not just about weight loss. Having great gut health is linked to good health throughout your body. Scientists in this rapidly growing field are finding connections between gut microbes and the  immune system, weight loss, gastrointestinal health, , allergies, asthma, and even cancer. With every study that’s published, scientists become more convinced that having a healthy gut leads to having a healthy body.
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