when i had a minor plateau in my weightloss... my trainer recommended increasing my caffine intake! totally a wives tale im sure... but
its a durectic (spell? it makes you eliminate "water")
gives you energy
increases met. rate temporarily
I brew myself a big 'ol cup (probably about 3-4 "normal" cups) of organic/fair trade coffee every morning and wouldn't dream of attempting my commute without it! I don't feel it's had any negative effect on my weight loss efforts.