Simple Science

Everything you read tells you that for healthy weight loss you want to lose between 1-2 pounds per week. There is some very simple science behind how to do this. When you're active, your body uses more energy (calories). And when you burn more calories than you consume, you lose weight loss.

Because 3,500 calories equals about 1 pound of fat, you need to burn 3,500 calories more than you take in to lose 1 pound. So if you cut 500 calories from your diet each day, you'd lose about 1 pound a week (500 calories x 7 days = 3,500 calories), SIMPLE!

Diet has a stronger effect on weight loss than physical activity does but physical activity, including exercise, has a stronger effect in preventing weight gain and maintaining weight loss.

This chart shows the estimated number of calories burned while doing various exercises for one hour. 

Activity(1-hour duration)	Weight of person and calories burned
	160 pounds (73 kilograms)	200 pounds (91 kilograms)	240 pounds (109 kilograms)
Aerobics, high impact	533	664	796
Aerobics, low impact	365	455	545
Aerobics, water	402	501	600
Backpacking	511	637	763
Basketball game	584	728	872
Bicycling, < 10 mph, leisure	292	364	436
Bowling	219	273	327
Canoeing	256	319	382
Dancing, ballroom	219	273	327
Football, touch or flag	584	728	872
Golfing, carrying clubs	314	391	469
Hiking	438	546	654
Ice skating	511	637	763
Racquetball	511	637	763
Resistance (weight) training	365	455	545
Rollerblading	548	683	818
Rope jumping	861	1,074	1,286
Rowing, stationary	438	546	654
Running, 5 mph	606	755	905
Running, 8 mph	861	1,074	1,286
Skiing, cross-country	496	619	741
Skiing, downhill	314	391	469
Skiing, water	438	546	654
Softball or baseball	365	455	545
Stair treadmill	657	819	981
Swimming, laps	423	528	632
Tae kwon do	752	937	1,123
Tai chi	219	273	327
Tennis, singles	584	728	872
Volleyball	292	364	436
Walking, 2 mph	204	255	305
Walking, 3.5 mph	314	391	469

Adapted from: Ainsworth BE, et al. 2011 compendium of physical activities: A second update of codes and MET values. Medicine & Science in Sports & Exercise. 2011;43:1575.