On average, 18 calories per day will maintain one pound of weight for one year. In other words, dropping 18 calories per day and doing nothing else will result in one pound of weight loss in one year for the average person.
If you want to lose weight doing cardio, there are two things to keep in mind:
1: the intensity is what matters. Walking for an hour a day will keep your heart healthy and might burn a bit of fat, but a 5-minute jog to warm up, twenty minutes of intense running, and a short cool-down walk until your heart rate drops back down, done every other day, will make you lose weight.
2: spreading out meals into smaller portions will keep your metabolism going faster. Combined with intense cardio, spreading out food intake (and, of course, eating healthy, with as much whole food as possible and as little refined sugar, etc.) is the easiest change you can make.
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