Surgery
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Nutritional deficiencies in patients after Roux-en-Y gastric bypass operations have been mainly attributed to dietary restriction. However, most of these studies have been performed during the period of greatest caloric restriction. ⋯ Roux-en-Y gastric bypass induces long-term changes in eating habits, independent of caloric intake. Iron continuously declines 6 to 8 years after surgery, depending (significantly) on the eating behavior, but not on the caloric intake.