Wheat was common all over Europe and was considered to be the most nutritious of all grains, but was more prestigious and thus more expensive. Fish was up to 16 times as costly, and was expensive even for coastal populations. As today, geese and ducks had been domesticated but were not as popular as the chicken , the fowl equivalent of the pig. Salting and drying was the most common form of food preservation and meant that fish and meat in particular were often heavily salted. By modern standards, the brewing process was relatively inefficient, but capable of producing quite strong alcohol when that was desired. Peter Damian Die in ?
There are a few that appear to be mildly effective. This includes Caffeine, Green Tea and Glucomannan (a fiber that can reduce appetite). However, the results are usually weak and inconsistent and certainly nothing to get excited about. At the end of the day, the only thing that is really proven to help you lose weight is changing your diet.