I keep hearing about food ingredients in cosmetics. Do they work? If that's the case, will they work if I just apply them to my face?

We are what we eat, as the old saying goes, and apparently our skin agrees. It may seem passé to rely on our mothers' at-home skin care recipes, but there's a reason why some skin recipes have lasted over time - they work. Some of the ingredients we bring into our bodies can also provide benefits when applied on the body as well.

If we take a close look at...