The biggest problem with Science is that it usually doesn't answer the questions we actually want answered. The problem happens when we try to extrapolate from scientific results. When we make claims about human nutrition based on experiments with rats. That's when we run into trouble.

Usually the scientific answer should be "we don't know".

(That's also the reason why people run to some quack doctor and start taking homeopathic remedies. You'll get answers there. Unfortunately, people trust those giving answers more than those saying "I don't know".)