Darwin officially published his theories in On the Origin of the Species in 1859. He knew his views would be controversial, especially with those who believed heavily in religion. His first edition of the book did not talk much about human evolution, but did hypothesize that there was a common ancestor for all life.
Dietician and nutritionist. It is safe to eat two or three serves of canned or fresh tuna or salmon a week. While pregnant women are advised to avoid eating a lot of fish that is high in mercury, tuna is generally considered to be low in mercury.f you usually enjoy eating a lot of fish, try to balance out the types of fish you have. Combine fresh tuna, sardines, pilchards and trout, with fish that have lower levels of pollutants, such as haddock, red snapper, ling or flathead. Read our full article on eating fish during pregnancy.
1 Smoked salmon is considered safe to eat in pregnancy, as the curing process destroys listeria bacteria. 2  However, if it hasn't been completely cured or frozen before you eat it, listeria bacteria may remain. 3  So if you choose to eat smoked salmon, make sure it is from a trusted source, such as a supermarket. So limit how much you eat of these fish to two portions a week. 2  Don't eat shark, swordfish and marlin, as these fish contain unsafe levels of mercury. 3  Tuna contains some mercury, too, so don't eat more than four medium-sized cans, or two fresh tuna steaks, a week. 4  Limit your caffeine intake to 200mg a day.