There are some good tips in the weight loss advice post - just look further down the page.

Also if you are not looking to loose weight just for the day I wouldn't bother with sweat suits.

I used to try to hold my weight down between fights which were only a week or two apart and found it near impossible for the second fight.

I was told that holding a semi-dehydrated state makes your body decide water is a precious resource and you loose less of it and hold onto more - making you HEAVIER!

A similar concept to the idea of completely cutting out carbs etc and being more prone to gaining weight again when you give in and eat.

If you drink more water you'll be more likely to loose weight.