the concept of low or non-fat is wrong, fat is necessary to a human diet and was ingested in our species for thousands of years before diabetes, obesity, and cardiovascular disease began crippling us into this flawed idea of less fat = better health. Its about choosing the right types of food and avoiding the processed foods with little or no nutritional value. This proposed regiment is considered "crash dieting" and you are highly likely to gain the weight back after you reincorporate the foods you opt out for the 6 months, because caloric starving will result in a reduction in your basal metabolic rate which will require to to maintain this lifestyle to keep your desired weight. Common supermarket foods have zero or little nutritional value which causes people to eat more because they are starved on a nutritional level. Add a crap diet and sedentary lifestyle and you get obesity, high risk for diabetes and cardiovascular disease. There's no secret scheme to being healthy, everyone knows how to do it, eat as you were intended to as a species and try to exercise more.