They also lose points with some users because they generate heat, which experts say can deplete important nutrients.

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Since many important nutrients are absorbed in the small intestine, patients can suffer problems related to malnutrition: osteoporosis, anemia, vitamin deficiencies.

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The scientists describe thoughts of God as providing the mind with "important psychological nutrients" that "refuel" our inner resources, much like Gatorade replenishes the body after a long run.

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Dr Elizabeth Weichselbaum, a nutrition scientist at the British Nutrition Foundation, says meat is an important source of a number of nutrients in our diet, including high quality protein, iron, zinc, selenium, vitamin D and some B vitamins.

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"Also, it's important to eat a variety of foods to make sure you get all the nutrients you need, " said a spokeswoman.

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