A fad diet often promises rapid weight loss or other health benefits like a healthier immune system or longer life. Often made popular by celebrities, these diets - such as Keto, SlimFast, Atkins, Low-Carb and diet pills - encourage weight loss through cutting out food groups or severely restricting calorie intake.

According to the NHS, the average man needs to eat 2,500 calories a day and the average woman needs 2,000. It also recommends a diet balanced with at least five servings of fruit and vegetables daily, as well as carbs, proteins, and fats.

"Consumers may be thinking 'there can't be any harm' in taking 'natural' pills or cutting out groups of foods, but they're really can be," she says.

"In addition, if crash diets are repeated frequently, this constant yo-yoing of weight has been associated with more weight gain, less exercise, and higher rates of binge eating."

If that wasn't enough to put you off, fad diets can also cause lasting damage to your metabolism - your body's natural process of converting food into energy.

You may well lose weight rapidly if you opt for a fad diet, but some of this is down to your body losing water weight, Kimber explains.