It's better to stick with 20, as this is the value most traders are using to make their decisions. Let me help you out if you are confused - kill the trade! It's one of the most popular indicators. The idea, using daily charts, is that when the indicator reaches its lowest level in 6 months, you can expect the volatility to increase. I am trying to do backtesting now, and see what the outcome is.
At the end of the day, the only thing that is really proven to help you lose weight is changing your diet. Exercise can help too, but what you eat is by far the most important. For a proven way to lose weight without hunger, check out this article. Like many before you, you may have discovered that restrictive dieting and excessive exercise are temporary solutions to lose weight.