Diets that include intermittent fasting are growing in popularity. The three popular types of intermittent fasting are "whole day," which means no food at all one or two days a week; "alternate day," which means small meals on specific days of the week and no restrictions on others; and "time-restricted feeding," which means eating only during a 4- to 8-hour window each day. Dr. David Agus joins "CBS This Morning" to discuss what scientists say about the trend.
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