Ease and Convenience: For some people, this diet may be a challenge to follow because the fasting days are not followed by "feasting" days. In fact, on the days when you are not fasting, you are advised to follow calorie-restriction guidelines and consume only enough calories to meet your energy needs. No foods are off limits and some limited indulgences are allowed, but many consumers who enjoy intermittent fasting do so because they don't have to count calories and because they can indulge without restriction on their non-fasting days.