Επηρεάζει Η Λήψη Υψηλής Πρωτεϊνης Τα Κόκκαλα;
Εχει υποστηριχτει στο παρελθον απο διαφορες αποψεις πως η καταναλωση επιπλεον πρωτεινης, μεγαλυτερης απο 0.8γρ ανα κιλο σωματικου βαρους, μπορει να ειναι επιβλαβης στην οστικη περιεκτικοτητα. Ωστοσο δεν υπαρχουν αμεσα στοιχεια που να αποδεικνυουν πως αυτη η διατροφη οδηγει σε απομεταλλωση του σκελετου.
Η μελετη αυτη ειχε ως σκοπο να απαντηθει αυτο ακριβως το ερωτημα.
24 γυναικες εθελοντες ακολουθησαν για 6 μηνες, χωρισμενες σε 2 group, ειτε την κανονικη τους διατροφη, ειτε διατροφη υψηλη σε πρωτεινες (2.2γρ ανα κιλο σωματικου βαρους).
Το αποτελεσμα ηταν πως η διατροφη υψηλη σε πρωτεινες δεν ειχε καμια επιδραση στην οστικη πυκνοτητα ολοκληρου του σωματος, την πυκνοτητα της οστικης μαζας, τα t-scores, την αλιπη σωματικη μαζα ή το σωματικο λιπος.
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High protein consumption in trained women: bad to the bone?
Jose Antonio, Anya Ellerbroek, Cassandra Evans, Tobin Silver and Corey A. Peacock
Journal of the International Society of Sports Nutrition201815:6
Background
It has been posited that the consumption of extra protein (>?0.8 g/kg/d) may be deleterious to bone mineral content. However, there is no direct evidence to show that consuming a high-protein diet results in a demineralization of the skeleton. Thus, the primary endpoint of this randomized controlled trial was to determine if a high-protein diet affected various parameters of whole body and lumbar bone mineral content in exercise-trained women.
Methods
Twenty-four women volunteered for this 6-month investigation (n?=?12 control, n?=?12 high-protein). The control group was instructed to consume their habitual diet; however, the high-protein group was instructed to consume =2.2 g of protein per kilogram body weight daily (g/kg/d). Body composition was assessed via dual-energy x-ray absorptiometry (DXA). Subjects were instructed to keep a food diary via the mobile app MyFitnessPal?. Exercise or activity level was not controlled. Subjects were asked to maintain their current levels of exercise.
Results
During the 6-month treatment period, there was a significant difference in protein intake between the control and high-protein groups (mean±SD; control: 1.5±0.3, high-protein: 2.8±1.1 g/kg/d); however, there were no differences in the consumption total calories, carbohydrate or fat. Whole body bone mineral density did not change in the control (pre: 1.22±0.08, post: 1.22±0.09 g/cm2) or high-protein group (pre: 1.25±0.11, post: 1.24±0.10 g/cm2). Similarly, lumbar bone mineral density did not change in the control (pre: 1.08±0.16, post: 1.05±0.13 g/cm2) or high-protein group (pre: 1.07±0.11, post: 1.08±0.12 g/cm2). In addition, there were no changes in whole body or lumbar T-Scores in either group. Furthermore, there were no changes in fat mass or lean body mass.
Conclusion
Despite an 87% higher protein intake (high-protein versus control), 6 months of a high-protein diet had no effect on whole body bone mineral density, lumbar bone mineral density, T-scores, lean body mass or fat mass.
https://jissn.biomedcentral.com/arti...970-018-0210-6
