Nutritionist May Simpkin said: “James and Adele are two extremes, in that one is an athlete who is in the gym a lot, building muscle, so his daily ­requirements are massive, and the other does not have much fat there to create the energy needed to cope.

“Without the nutrient profile and the calories specifically they’re going to be in trouble and suffer.

“Every person is different and their requirements are different and really, if the producers were on it, they would have to look at each person’s individual nutritional requirements.

“That would actually be the better way of doing it.”

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