Famine may have a lasting impact on male descendants of its victims
New research suggests that periods of fasting or starvation may significantly shorten the lifespans of both children and their male descendants. -source link
As I've commented previously elsewhere, real periods of famine should not offer optimal rich micronutrient diets in general, and should thus most probably not see the benefits of calorie restriction on lifespan. Calorie Restriction requires optimal micronutrient supply for it to actually extend lifespan, in real life situations it is difficult for this to happen, especially at the more extreme levels of calorie restriction. The more extreme the level the more unlikely it is that in a natural environment optimal nutrient intake will be attainable.
Also there were comments saying that in adulthood there was also a need to gradual transition from regular to calorie restricted diet, in order to see benefits, iirc. Again not necessarily guaranteed in natural environment famines.
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