Weight loss companies

• HLF         Herbalife                  7.74B
• WTW      Weight Watchers     1.86B
• NTRI       NutriSystem         553.23M
• MED       Medifast               361.13M

1-year performance (till 5 Dec 2013)

1-year Yahoo charts http://finance.yahoo.com/q/bc?t=1y&s=WTW&l=on&z=m&q=l&c=NTRI%2CMED%2C+HLF%2C+&ql=1
http://finviz.com/screener.ashx?v=211&t=WTW,NTRI,MED,HLF&ta=0&o=-averagevolume