IMPACT OF DEFICIENT NUTRITION IN BONE MASS AFTER BARIATRIC SURGERY.
BACKGROUND
Essential nutrients are considered for the prevention of the bone loss that occurs after bariatric surgery.


OBJECTIVE
Evaluate nutrients involved in bone metabolism, and relate to serum concentrations of calcium, vitamin D, and parathyroid hormone, and the use of supplements and sun exposure on the bone mass of patients who had undergone gastric bypass surgery.


METHODS
An observational study, with patients who had undergone the surgery 12 or more months previously, operated group (OG), compared to a control group (CG).


RESULTS
Were included 56 in OG and 27 in the CG. The mean age was 36.4±8.5 years. The individuals in the OG, compared to CG, consumed inadequate amounts of protein and daily calcium. The OG had a higher prevalence of low sun exposure, lower levels of 25OH Vitamin D (21.3±10.9 vs. 32.1±11.8 ng/dl), and increased serum levels of parathyroid hormone (68.1±32.9 vs. 39.9±11.9 pg/ml, p<0.001). Secondary hyperparathyroidism was present only in the OG (41.7%). The mean lumbar spine bone mineral density was lower in the OG. Four individuals from the OG had low bone mineral density for chronological age, and no one from the CG.


CONCLUSIONS
The dietary components that affect bone mass in patients undergoing bariatric surgery were inadequate. The supplementation was insufficient and the sun exposure was low. These changes were accompanied by secondary hyperparathyroidism and a high prevalence of low bone mass in lumbar spine in these subjects.
Hospital de Clínicas, Federal University of Paraná, Curitiba, PR, Brazil.
Tatiana Munhoz da Rocha Lemos
TM
Costa
Hospital de Clínicas, Federal University of Paraná, Curitiba, PR, Brazil.
Mariana
M
Paganoto
Hospital de Clínicas, Federal University of Paraná, Curitiba, PR, Brazil.
Rosana Bento
RB
Radominski
Hospital de Clínicas, Federal University of Paraná, Curitiba, PR, Brazil.
Victoria Zeghbi Cochenski
VZ
Borba
D000328:Adult; D050110:Bariatric Surgery; D015519:Bone Density; D002118:Calcium / Q000097:blood; D003430:Cross-Sectional Studies; D005260:Female; D005502:Food; D006801:Humans; D008297:Male; D044342:Malnutrition / Q000097:blood / Q000378:metabolism*; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood; D011183:Postoperative Complications / Q000097:blood / Q000378:metabolism*; D014807:Vitamin D / Q000097:blood
D010281:Parathyroid Hormone; D014807:Vitamin D; D002118:Calcium