The US measures infant mortality very differently than other countries, you can't do an "apples to apples" comparison just by naively looking at statistics.

Edit: Here's a relevant reference, from the WHO, if anyone has doubts about this being a serious issue: http://www.who.int/bulletin/volumes/86/6/07-043471/en/

The US is within a small margin of error to being on par with both Japan (adjusting for their huge fraud in longevity) and South Korea on life expectancy. That sure sounds amazing considering our obesity / diet problems. I'd argue in fact that our advanced healthcare system and large investment is the only reason Americans aren't dying at 70 instead - we're able to keep people alive that would otherwise die much younger. I'd argue if you matched diets to other countries with very high life expectancies, we'd easily match or surpass them in longevity and live to 83 to 85. Our problem is mostly lifestyle.

Infant mortality? What, you think Bosnia and Russia actually beat the US in infant mortality, or is it more likely they're lying? (given Russian men live to 60).