It's just one study, but the study seems to show a possible causality between over-consumption of fructose and eventual obesity.
http://www.physorg.com/news143350658.html
The idea is that fructose increases triglycerides, and that stops an appetite hormone (leptin) from being taken up by the brain. The brain becomes resistant, and then stops telling the body to stop eating.
The cool part of the study is that they did the fructose thing to two groups of rats, and kept diet normal, THEN, after six months of this, they switched the rats to a typical American diet. The fructose rats gained a lot more weight. So the consumption of the fructose didn't directly lead to weight gain, it was some kind of aftereffect on the regulation of their appetite that made them more susceptible to bad diet.
My interpretation of this is that if we keep Niall away from wasted calories of sugar as much as possible, and if we keep him active and interested in sports and activity and exercise, then when he's an adult setting his own diet, and accessing the high-fat, high-calorie options, he might have better appetite control.
One can hope.
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