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- Title
Severely restricting energy intake for 24 h does not affect markers of bone metabolism at rest or in response to re-feeding.
- Authors
Clayton, David J.; James, Lewis J.; Sale, Craig; Templeman, Iain; Betts, James A.; Varley, Ian
- Abstract
Purpose: Intermittent energy restriction commonly refers to ad libitum energy intake punctuated with 24 h periods of severe energy restriction. This can improve markers of metabolic health but the effects on bone metabolism are unknown. This study assessed how 24 h severe energy restriction and subsequent refeeding affected markers of bone turnover. Methods: In a randomised order, 16 lean men and women completed 2, 48 h trials over 3 days. On day 1, participants consumed a 24 h diet providing 100% [EB: 9.27 (1.43) MJ] or 25% [ER: 2.33 (0.34) MJ] of estimated energy requirements. On day 2, participants consumed a standardised breakfast (08:00), followed by an ad libitum lunch (12:00) and dinner (19:30). Participants then fasted overnight, returning on day 3. Plasma concentrations of C-terminal telopeptide of type I collagen (CTX), procollagen type 1 N-terminal propeptide (P1NP) and parathyroid hormone (PTH) were assessed as indices of bone metabolism after an overnight fast on days 1–3, and for 4 h after breakfast on day 2. Results: There were no differences between trials in fasting concentrations of CTX, P1NP or PTH on days 1–3 (P > 0.512). During both trials, consuming breakfast reduced CTX between 1 and 4 h (P < 0.001) and PTH between 1 and 2 h (P < 0.05), but did not affect P1NP (P = 0.773) Postprandial responses for CTX (P = 0.157), P1NP (P = 0.148) and PTH (P = 0.575) were not different between trials. Ad libitum energy intake on day 2 was greater on ER [12.62 (2.46) MJ] than EB [11.91 (2.49) MJ]. Conclusions: Twenty-four hour severe energy restriction does not affect markers of bone metabolism.
- Subjects
BONE metabolism; BIOMARKERS; COLLAGEN; DIET in disease; DIET therapy; FASTING; INGESTION; PARATHYROID hormone; PEPTIDES; STATISTICAL sampling; RANDOMIZED controlled trials; TREATMENT effectiveness
- Publication
European Journal of Nutrition, 2020, Vol 59, Issue 8, p3527
- ISSN
1436-6207
- Publication type
Article
- DOI
10.1007/s00394-020-02186-4