Unlike most diets with a plan to follow day in, day out, on alternate day or intermittent fasting diets you’ll have one completely normal day followed by a day of eating much less.
Some ADF diets suggest two days of fasting a week instead (the 5:2 day fasting diet), and ‘fasting’ can mean anything from total abstinence to half of your recommended daily intake. Dr Johnson’s book recommends eating 20% of your normal calorie intake (that’s just 400 calories for the average woman).
But the principle is the same – it doesn’t matter what you eat on either day, as long as you fast.
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