After about 2 months of doing the same exercise (the same walk, distance/same heart rate/pace etc) your body adapts and the weight will plateau or increase again. One reason my mailman is obese.

You have to mix it up, increase distance or pick up the pace.

Adding muscle increases weight but your are more efficient at burning calories.

I'm not sure using supplements are a good idea. Goals can be attained by hard work and the right attitude. I messed with Ephedra years ago. Not good. No wonder they banned it. Tolerance builds up in a matter of a few weeks, need to use more $$. Then you come off it and crash... ugh.

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'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder