A new study suggested that eggs are not bad for your heart. Nutritional science is notoriously tricky — almost all of it is observational, meaning scientists can see that, say, people who eat more asparagus tend to be healthier, but not whether the asparagus makes them healthier, or whether people who are healthier for other reasons also tend to eat asparagus. Unusually this was a randomized controlled trial, with 70 people on an eggy diet, and 70 on a low-egg diet, for four months: It found no difference in cholesterol levels at the end of the experiment. The study was small and short-term, so not conclusive, but it is a rare bit of causal evidence in a field crammed with weak research and overconfident claims. |