In their quest for healthy eating, many Americans are turning to restrictive diets – from vegan to Paleo to low-carb – that they believe are the most “pure” or beneficial. But when people decide to go beyond these and severely limit the types of foods they consume, they could be putting themselves at risk for nutritional deficiencies.People who obsessively refine and restrict their diet to conform to their ideal of what is healthy could be suffering from orthorexia nervosa – which translates from Greek as “correct appetite.”