Journal of Nutritional Sciences and Dietetics 2015. 1(3):134-140.

The short-term influence of gastric bypass surgery on dietary intakes in morbidly obese patients
Mehri Mirahmadian, Motahareh Hasani, Ehsaneh Taheri, Abbasali Keshtkar, Saeed Hosseini, AbdolReza Pazooki


Background: Obesity is recognized as a major public-health problem, which has reached epidemic proportions, in both developed and developing countries. The purpose  of   this   survey  is   to   study  effects  of   gastric  bypass  surgery  at micronutrients and macronutrients intake on patients with morbid obesity.

Methods:   This quasi-experimental study was conducted on 21    patients. Anthropometry information (weight, height, age, and gender) and three 24-hour recall questionnaires were completed for each participant: Before surgery and 3 months after surgery.

Results: The total intake of macronutrients including carbohydrate, protein and fat decreased between baseline at 3 months post-surgery that was statistically significant for all of the macro-nutrients (p < 0.001). There was a reduction of energy intake from carbohydrate (54.81% ± 20.03% to 44.34% ± 14.59%, p = 0.059) and the energy intake from protein (18.57% ± 5.73% to 26.24% ± 9.83%, p = 0.001) and fat (31.06%± 8.64% to 35.18% ± 25.41%, p = 0.460) along the prospective follow-up period compared to previous values. The mean intake of all micronutrients had decreased during follow-up that was statistically significant for B group vitamins (B1, B2, B3, and B6), float, iron, zinc and copper (p < 0.017 for vitamin B2, p < 0.001 for others).

Conclusion: Our data demonstrate that low dietary intake of energy, micro- and macro-nutrients  absolute   values   and   relative   to   the   recommended   dietary allowances and estimated average requirements, are highly prevalent after Roux- en-Y  gastric  bypass  (RYGB)  surgery.  Therefore  dietary  counseling,  clinical assessments, and the recommendation of supplements if needed in pre- and post- operatively, might be considered for health promotion after RYGB surgeries.


Gastric bypass surgery;Food intake; Morbid obesity

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