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Effect of the “protein diet” and bone tissue.

UNLABELLED
The aim of this study is to evaluate the effect of the hyperproteic diet consumption on bone tissue.


METHODS
The study was conducted during sixty days. Twenty eight Wistar albinus rats, adults, originated from Laboratory of Experimental Nutrition were divided in four groups: (n = 7); Control 1 (C1), Control 2 (C2), Hyperproteic 1 (HP1) e Hyperproteic 2 (HP2). The C2 and HP2 groups were submitted to 30% of food restriction. The hyperproteic diet was based on the Atkins diet and prepared to simulate the protein diet. At the end of the study the animals were anesthetized to performer bone densitometry analyses by DEXA and blood and tissue collection. Serum and bone minerals analyses were conducted by colorimetric methods in automated equipment.


RESULTS
The total bone mineral density (BMD) of the pelvis and the spine of the food restriction groups (HP2 e C2) were lower (p < 0.05) than C1 e HP1 groups. While the femur BMD of the HP2 was lower (p < 0.05) related to others groups. It had been observed reduction (p < 0.05) in the medium point of the width of femur diaphysis and in bone calcium level in the hyperproteic groups (HP1 e HP2). It was observed similar effect on the osteocalcin level, that presented lower (p < 0.05) in the hyperproteic groups. The insulin level was lower only in HP2 and serum calcium of the HP1 and HP2 groups was lower than C1.


CONCLUSION
The protein diet promotes significant bone change on femur and in the hormones levels related to bone synthesis and maintenance of this tissue.