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Not all calories are created equal, and some could do far greater harm to men's health, new research suggests.

A small study led by a team from the University of Copenhagen in Denmark suggests that ultra-processed foods (UPFs) may negatively affect men's metabolism and fertility even when calorie, protein, carbohydrate and fat intake are the same as a whole-food diet.

The research, published this month in the journal Cell Metabolism, followed 43 men, ages 20 to 35, who each spent three weeks on both a highly processed and minimally processed diet.

'FOOD IS MEDICINE' MOVEMENT MAY BE KEY TO REVERSING HEALTH DECLINE: HERE'S WHAT TO EAT

The ultra-processed plan included ready-to-eat meals, sweetened cereals, processed meat

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