Problem 1. Lowering your calories too much
Fact: It takes calories to burn calories. When you decrease your food intake, your body simply lowers its metabolic rate in response. This still allows the body to function properly, but ultimately your body requires fewer calories which creates hunger and prevents you from losing fat.
Keep your calories slightly below your maintenance calories so that your energy and metabolism remain high. A deficit greater than 500-700 calories makes it much more difficult to maintain your lean body mass. To determine your approximate daily caloric needs, use this formula:
kg (body weight) x 24 = kcal/day
kg (body weight) x 23 = kcal/day
note: kg = pounds divided by 2.2 (i.e.: 180 lbs / 2.2 = 81.8 kg)
You can also calculate your Basal Metabolic Rate to determine how many calories you need to function, and then use a calorie calculator to add in calories you burn through out the day and with exercise.
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