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Quadbeak - 12 - Quadbeak - 3lbs in 1 week doesn't mean much really. It could be water weight, etc.
It's probably more prudent to monitor your weight changes in bi-weekly or monthly intervals, as week by week can give uneven results.
"Weight loss is a marathon not a sprint" 
3 lbs is a lot if you been doing what your doing
To clarify what I meant :
Losing 3lbs one week means nothing if you go up 4lbs the week after, which is why I suggested he measure his weight bi-weekly or monthly.
Longevity is the key to serious weight loss, and in my experience weighing oneself every week is unnecessary.
Every month weigh-ins always seem like you've done more work!
agree