Appendix 2. Excluded articles and reasons for exclusion (n = 10).

Author, Year / Reason for exclusion
Bortoluzzo 2005 [1] / 3
Carrasco et al, 2012 [2] / 5
Kohylas and Lapatsanis, 2016 [3] / 6
Marcelino 2014 [4] / 6
Menegati et al, 2016 [5] / 6
Muschitz et al, 2016 [6] / 4
Provenzale et al, 1992 [7] / 4
Savastano et al, 2010 [8] / 2
Swenson et al, 2007 [9] / 4
Tirosh et al, 2015 [10] / 2

Legend - Exclusion criteria: 1) Children, adolescent (under 19 years old) or elderly (over 60 years old); 2) Other bariatric surgery technique than Roux-in-Y gastric bypass and sleeve gastrectomy; 3) Less than 6 months of follow up; 4) No protein intake data; 5) No outcome data reported (lean mass or serum protein); 6) Reviews, letters, conference abstracts, editorials and cross-sectional studies.

References

1. Bortoluzzo RF. Nutritional evolution and food pattern of morbid obese individuals underwent to bariatric in a Public Health Hospital. [Thesis] University of São Paulo, São Paulo, 2005.

2. Carrasco F, Rojas P, Csendes A, Codoceo J, Inostroza J, Basfi-fer K, et al. Changes in ghrelin concentrations one year after resective and non-resective gastric bypass: associations with weight loss and energy and macronutrient intakes. Nutrition. 2012;28(7-8):757-61.

3. Kohylas N, Lapatsanis D. Metabolic deficiencies after a restrictive bariatric operation. Obes Facts. 2016; 9: 317.

4. Marcelino FC. Avaliação das práticas de atividade física em pacientes obesos mórbidos submetidos à operação de bypass gástrico com reconstrução em y de roux com anel. Revista Brasileira de Obesidade, Nutrição e Emagrecimento. 2014;8(43):24-30.

5. Menegati GC, de Oliveira LC, Santos ALA, Cohen L, Mattos F, Mendonca LMC, Carneiro JRL, et al. Nutritional status, body composition, and bone health in women after bariatric surgery at a university hospital in Rio de Janeiro. Obes Surg. 2016; 26(7): 1517-24.

6. Muschitz C, Kocijan R, Haschka J, Zendeli A, Pirker T, Geiger C, et al. The impact of vitamin D, calcium, protein supplementation, and physical exercise on bone metabolism after bariatric surgery: The BABS study. JBMR. 2016; 31(3): 672-82.

7. Provenzale D, Reinhold RB, Golner B, Irwin V, Dallal GE, Papathanasopoulos N, et al. Evidence for diminished B12 absorption after gastric bypass: oral supplementation does not prevent low plasma B12 levels in bypass patients. J Am Coll Nutr. 1992;11(1):29-35.

8. Savastano S, Angrisani L, Di Somma C, Rota F, Savanelli MC, Cascella T, et al. Relationship between growth hormone/insulin-like growth factor-1 axis integrity and voluntary weight loss after gastric banding surgery for severe obesity. Obes Surg. 2010;20(2): 211-20.

9. Swenson BR, Schulman A, Edwards MJ, Gross MP, Hedrick TL, Weltman AL, et al. The effect of a low-carbohydrate, high-protein diet on post laparoscopic gastric bypass weight loss: a prospective randomized trial. J Surg Res. 2007;42(2):308-13.

10. Tirosh A, de Souza RJ, Sacks F, Bray GA, Smith SR, LeBoff MS. Sex differences in the effects of weight loss diets on bone mineral density and body composition: pounds lost trial. JCEM. 2015;100(6):2463-71.

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