This one caught my eye today.
If you pick up any packet of cereal you find it is enriched with vitamins:
Maize, Brown Sugar (Sugar, Molasses), Peanuts (7%), Sugar, Honey (2%), Barley Malt Flavouring, Salt, Niacin, Iron, Vitamin B6, Riboflavin (B2), Thiamin (B1), Folic Acid, Vitamin B12.
Some Chinese scientists have just done a study indicating that Niacin can mess up insulin sensitivity....and make you fat
A research team from China examined the role of excess nicotinamide in glucose metabolism using co-loading of glucose and nicotinamide test. They proved that excess niacin intake-induced biphasic response, i.e., insulin resistance in the early phase and hypoglycemia in the late phase, may be a primary cause for the increased appetite in obesity. Their study will be published on May 21, 2010 in the World Journal of Gastroenterology.I've not been able to access the full article yet but I certainly think there are some interesting implications there. Especially the last bit - exercise and sweating is healthy too in that it gets rid of excess niacin.
The study also revealed for the first time that the obesity prevalence among US children and adolescents increased in parallel with the increase of the per capita niacin consumption with a 10-year lag, in which niacin fortification-induced sharp increase in niacin contents in grain products may play a major role. Reducing niacin intake and facilitating niacin elimination through sweat-inducing physical activity may be a key factor in the prevention and treatment of obesity.