Although some diet plans may recommend consuming 1,000 calories a day or less as an effective tool for weight loss, it is not safe and is an unsustainable way to try and lose weight.

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The 1,000-calorie diet History “In the 1960s, calorie counting became really quite fashionable,” Dr Myriam Wilks-Heeg, a lecturer in 20th-century history at the University of LiverpoolWilks ...

Since most people need to consume between 1,600 and 3,000 calories to maintain their weight, trying a 1,200-calorie diet plan creates a significant calorie deficit that can promote rapid weight loss.

Is the 1,000-Calorie-a-Day Diet Safe? A 2013 study suggested that prescribing 1,000-calorie diets versus 1,500-calorie diets ...