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RE: Right on
Diet info on packages are for 2000 and 2500 calories per day. Still too much...
Actually, if the package describes an entire day's intake it may be right on the money. Combine 1500 calories of lethargic waking day activity with 700-ish calories of sleep and the body will achieve neutral balance with that diet. It's actually unhealthy to diet (for long term effects) by cutting the nutrients to your body and remaining inactive.
Can a fat person do 50 minutes on an elliptical trainer a day? The fatter you get the less likely you recover...
Sure. Just because they're on an elliptical trainer doesn't mean they have to be going all out like everyone else. I've seen plenty of fat people at our gym on the elliptic machines and treadmills just slowly moving along. But that's what matters most for weight loss - 65-65% target heart rate activity for long durations. The guys in the Army's weight control program that lost the weight the fastest (and longest) were the ones who were required to walk everywhere all day rather than simply run two extra miles at the end of the day.
But if the person is so obese that it's not possible for joint pain - then 20 minutes is better than not going at all. They just need to follow it up with something like an exercise bike (even less impact) to maintain that heart rate for a little bit longer to benefit from the exercise.
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