“Consumption of fructose increases insulin resistance, which results in poor metabolic function.  In very basic terms, you will not be able to eat as many carbohydrates and remain healthy. Most importantly, carbohydrates are delicious, so for sanity sake we want to be able to eat as many of them as possible while reaching our goals. ;)”
…This is the same phenomenon that allows your friend to stay thin while you gain weight with the same food and exercise regiments. When the diet is poor (although one might not be putting on weight) I would argue that that person is doing as much damage if not more to their body than the person putting on weight….
What we do not measure will get lost in the noise of our inconsistent memory. Nothing will change if we are living comfortably and creating no frame of reference for improvement. If we want to improve something, find a way to measure it and record it. Make a hypothesis, execute the hypothesis and record the results…
“If you have high self esteem your historian might write you in for more than your share and if you have low self esteem you may think you are hopeless and cutting yourself short. The only way to know for sure is to put in a system to keep that historian in check. A system that gives you unbias data work with….”