Singer thinks using scales is setting yourself up to fail diets.
Janet Jackson doesn't weigh herself.
The ambassador for weight loss plan NutriSystem admitted she opts not to know how much she weighs as a way to stay healthy.
Janet told People: ''I don't know how much weight I've lost, only because I stay away from the scale.''
Speaking at Marco Glavianos Supermodels exhibit in New York recently she said focusing on weight is setting yourself up for failure on diets.
She said: ''I don't think [stepping on the scale] is healthy. You're setting yourself up to fail and women's bodies fluctuate every month - certain time of the month in particular - we bloat a great deal.''
The sibling of the late Michael Jackson turned 46 yesterday (16.05.12) and became the diet company's spokeswoman in December.
She added: ''It works, point blank. You don't have to starve yourself getting there.
''I love Caramel apples! NutriSystem doesn't have that, so that's probably my cheat food. I go out to dinner with friends [too], but then I just get back on it. It's about maintenance.''
However the 'All For You' singer admitted she has to exercise hard to look as good as she does.
She confessed: ''If I'm getting ready for something like a tour, I work out six days a week. I like to switch it up. I may go for a run or bike.
''I'm really happy with the way that I feel at the moment. I feel very good, and it's been a long time since I've felt this good.''