Estimates of life expectancy changes from nutritional epidemiology studies are often crude and likely overstate real benefits or harms.

“well these estimates obviously are tongue-in-cheek they're they're not real estimates they're a very crude translation of what the average person in the community would get if they see the numbers that are reported typically with relative risks in the communication of these findings they're not epidemiologically sound you know the true translation to change in life expectancy would be much smaller but even then they would probably be too big compared to what the real benefits might be or the real harms might be with these nutrients”