drgary wrote:BTW, where did you read that, Cliff? It seems to be a very strong and generalized claim.
I think it is probably a "reasonable" estimate, depending on how you interpret it. If applied to the greater population, it would mean that,
on average, 20% of the cardiovascular morbidity that one sees in the population, that can be attributed to elevated serum cholesterol, can be tied to what people have been eating in the recent past (and what that has done to their observed serum lipid numbers).
The weakness in such a statement is obvious on more than one count. There are going to be people who have almost no change in their serum cholesterol numbers in relationship to what they have been eating recently. There will be other people who have lots of reaction in their serum cholesterol in response to what they eat. Averaged, this could come to around 20%.
Missing also in such in a statement is the relationship of obesity and inactivity to serum cholesterol numbers and cardiovascular risk. Since we have a huge obesity problem in the developed world, and that is hugely and negatively correlated with cardiac health (and serum cholesterol) this becomes a second order effect of what one eats (e.g. too much in this case) and what one gets as a result. It is not related directly to what was consumed recently, rather it is spread over a much longer time span and not used in computing the relationship as being at 20% of "what you eat."
So, if you consider obesity in the mix, "what you eat" is responsible for much more than 20% of the morbidity, however if you look at it very narrowly, e.g. what you ate between a week ago and today, then the 20% is probably reasonable, when spread around to cover the whole population.
ken