The best replacement for calorie restriction is exercise.

The best alternatives to calorie restriction are rated as following:
★★★★★  exercise
★★★★  intermittent fasting
★★★  fasting
★  caloric restriction

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Speaking about calorie restriction, one probably shouldn't forget about intermittent fasting.

Other search terms related to calorie restriction and their ratings are:
★★★★★ intermittent fasting
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calorie restriction
exercise
intermittent fasting