In determining your current health risk, does it matter what your past medical statistics were, or only your current medical statistics matter?
Thought experiment 1 (TE1): If there are two twins A and B, A has high blood sugar his whole life and B has had low blood sugar for the first half of his life and high blood sugar for the second half of his life, do they currently have the same risk of getting diabetes?
Thought experiment 2 (TE2): If there are two twins C and D, C has had high cholesterol for his whole life but recently got it down to normal levels, whereas D has always had normal levels, who has higher risk of developing coronary heart disease (CHD) currently?
Followup question: If past medical statistics matter, is it the accumulation or trend that matters? For example, in TE2, if trend matters, C has a better trend and hence lower risk of CHD. If accumulation matters instead, then C has a higher risk of CHD because of past unhealthy statistics.