Ketone bodies: Ketone bodies are produced when the carb reserves (glycogen) start declining and the body must rely on fat reserves for fuel. Our liver then starts producing ketone bodies — a little molecule that can acts as a substitute for glucose (our brain’s favorite fuel). You can force your body to produce these ketone bodies by following a very low-carb, ketogenic diet.
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Ultimately, you need to pick a healthy eating plan you can stick to, Stewart says. The benefit of a low-carb approach is that it simply involves learning better food choices—no calorie-counting is necessary. In general, a low-carb way of eating shifts your intake away from problem foods—those high in carbs and sugar and without much fiber, like bread, bagels and sodas—and toward high-fiber or high-protein choices, like vegetables, beans and healthy meats.
A diet that’s low in fat and carbohydrates can improve artery function, according to a 2012 study by Johns Hopkins researchers. After six months, those on the low-carb diet had lost more weight, and at a faster pace. But in both groups, when weight was lost—and especially when belly fat shrank—the arteries were able to expand better, allowing blood to travel more freely. The study shows that you don’t have to cut out all dietary fat to shrink belly fat. For heart health, simply losing weight and exercising seems to be key. 
Another win for your morning cup of joe: Caffeinated coffee keeps things moving through the digestive tract. Since staying regular is key to a tighter-looking tummy, drinking about 8 to 16 ounces of java at the same time every day can help you stay on schedule. Remember: Sugary drinks can lead to weight gain, so skip fancy flavorings and synthetic sweeteners containing sugar alcohols, which can cause bloating.
"Your body needs a healthy balance of exercise and rest. Doing too much prevents the body from shifting excess fat. Exercising without rest can impact our levels of the steroid hormone cortisol and cause an increase of stubborn fat stored in the belly. Not allowing your body to recover can increase the risk of injury too, so make sure you factor in rest days to your plan."
Before we answer those questions, it’s important to understand how fuel (carbs, fat and protein) is transformed into energy and in which cases they are stored as fuel. To be used by our cells, the different types of fuel must go through several stages of transformation to become the one and only form of  “usable” energy: adenosine triphosphate — more commonly referred to as ATP. ATP is the universal energy currency for many living organisms from mammals to insects and fungus to plants.

Remove cardio and maintain the weight training and fat loss results will still come, provided their nutrition is sound. Furthermore, their physiques will look vastly more impressive compared with those who emphasize aerobic work at the expense of resistance training. By removing weight training and continuing cardio, however, a person will no doubt begin to resemble one of those unhealthy looking marathon runners, the only class of people who appear to have mastered the art of looking lean and fat at the same time.
2. Clean eating- foods we purchase daily are filled with added preservatives and sugars.  Refined sugars are a diet disaster.  It is important to limit processed foods.  Aim to eat foods that contain less than 6 ingredients.  Try not to eat things that have sugar as one of the top 4 ingredients.  This can be written as sugar, corn syrup, fructose, and many other names.  Stick to whole foods like fresh fruits and vegetables and whole grains such as quinoa, barley, and brown rice.
But in today's unenlightened "believe everything you hear" age this most effective and proven approach, for some strange reason, does not seem to attract much interest. This is no more obvious when one witnesses the "technological" revolution that is happening within the fitness industry, where a newer even more ridiculous gadget compared to the one that preceded it promises to build you the body of your dreams, with little effort on your part, "in 30 days or your money back"; where a machine that does most of the work for you is touted as a suitable replacement for actually applying a modicum of effort. https://www.youtube.com/watch?v=mDHGaU_jGrQ
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