In Reply: Neither we nor Dr Peeters et al1 estimated the health effects of lifelong obesity.
Both studies examined life expectancy, not health effects overall. Both also
examined association and thus can only infer effects. Finally, neither group
examined associations of lifelong obesity with life span. We examined associations
with having a particular BMI level lifelong, whereas Peeters et al examined
the association of being obese at a particular time point with longevity,
regardless of subsequent obesity status. It seems incorrect to label this
lifelong obesity. Indeed, Peeters et al now write that they " . . . aimed
to identify the loss of life expectancy associated with obesity at age 40, regardless of future changes in BMI [emphasis added]."
Allison DB, Westfall AO, Redden DT, Wang C, Fontaine KR. Methods of Estimating Years of Life Lost Due to Obesity. JAMA. 2003;289(22):2941–2942. doi:10.1001/jama.289.22.2941-a
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