The study of weight gain, weight loss and obesity is a mine-field of junk science, uninformed opinions and scams. The amount of misinformation is overwhelming. You have to skillfully identify reliable sources and untainted studies.
The common belief that people get fat mainly because they eat too much is today facing a strong challenge, backed up by good scientific evidence. The evidence points more to what we eat rather than the amount.
Some fat and obese people are bewildered by their increasing weight gain, because they feel they do not really eat more than the average person. Some even consciously reduce the portion sizes of what they eat but still gain weight.
There is a growing community of health scientists, nutritionists, and healthy eating advocates, that now believe that the over consumption of sugar is the fundamental cause.
For many years we have been told that we get fat from eating foods with a high fat content. Therefore to avoid getting fat, the advice has always been to cut down on the consumption of fatty foods, particularly meat.
Many popular diet plans were created from this promise, with questionable degrees of success, but mostly failure. New research claims that the over consumption of sugar is the real cause of the epidemic of weight gain we are seeing in most of the developed world.
Corn sugar is targeted as the main source of this worldwide problem. A major voice in the campaign to get us to reduce our intake of sugar is Dr. Robert Lustig. He calls this fructose from corn, "poison".
His eye-opening expose, "Sugar the Bitter Truth", has been viewed over four million times on YouTube. His argument is both compelling and alarming. In this presentation he quite convincingly follows the obsession pandemic back to ubiquitous use of fructose from corn in fast foods, pre-packaged foods and drinks.
Reputable food scientists worldwide are in agreement with his findings.
I watched this video a few times and I took a closer look at the contents listed on the labels of many foods in the grocery. Almost all processed foods on the shelves have fructose corn syrup as an ingredient.
The evidence that this excessive consumption of sugar is the main cause of the dramatic evolutionary change in our physical appearance is hard to refute. Both short and long-term studies show clear links between the preponderance of sugar in our diet and the large protruding stomachs that are now the norm.
The food industry as a whole seems quite relevant to publicly acknowledge its major role in the cause of this "pandemic" (as Dr. Lustig calls it).
Some in the anti-sugar camp claim that the processed food industry veterans have known about this problem for years and carefully covered it up to keep making their huge profits. They put their greed ahead of public health.
You must watch Dr Lustig's video. He is an academic, and you could get a bit lost when he gets into the heavy scientific details, but stay focused and watch it a couple of times. This is a wakeup call for all of us.