Interesting that you attribute a particular tendency for weight gain to Germans. My half Polish school paraprofessional and babysitter said that he was so slender (20.3 BMI) in part because of his maternal German/Welsh side moderating the stocky paternal Polish influence.
https://www.theapricity.com/forum/sh...ish-Babysitter
Just because his maternal side was more slender than his paternal side does not mean Polish people are genetically more prone to obesity (these nations in fact all have a quite similar obesity rate near 25%). He made a rather brash generalization there. In truth there is currently no study indicating that the moderate variation in European obesity rates is primarily genetic in basis. In Africa by contrast there are populations with extreme skewed somotype distribution like Nilotes whose typically lanky build is the result of genetic rather than cultural factors.
Lithuanians have a diet excessively high in red meat and dairy (1025% and 433% of recommend intake respectively according to Global Nutrition Report) even by American standards (255% and 205% of recommend intake respectively by same source) and with a relatively limited consumption of fruits and vegetables. Since the 1990s there has also been a trend of reduced physical activity. Don't discount cultural factors.
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