Worst – Swordfish

A swordfish steak. (Photo by: Jeffrey Greenberg/Universal Images Group via Getty Images)

While some varieties of fish are rich in healthy fats, others are not. An example of those on the negative side is swordfish. The fish has a high level of mercury. Mercury has adverse effects on hair growth. Other varieties that have the same effect are some tuna types and mackerel. However, there are several healthy options. Examples include salmon, crab, and shrimps to mention a few.