Effetti di Vitamina D e calcio nella dieta

[gian90]

Diet induced thermogenesis, fat oxidation and food intake following sequential meals: Influence of calcium and vitamin D.

Chan She Ping-Delfos W, Soares M.
Curtin Health Innovation Research Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.
Abstract

BACKGROUND & AIMS: The mechanisms linking dietary calcium and vitamin D to body weight regulation require confirmation.
METHODS: Eleven subjects, aged (mean ± SEM) 54 ± 1.2 y and BMI 31 ± 2.4 kg/m(2), participated in a randomised within-subject, sequential meal protocol comparing a low calcium trial (LCT) to an isoenergetic high calcium trial (HCT). Diet induced thermogenesis (DIT), fat oxidation rates (FOR), serum leptin, subjective feelings of hunger/satiety were measured at fasting and hourly over 8 h. Spontaneous food intake at a buffet and over the following 30 h was recorded. Postprandial responses, calculated as change (Δ) from baseline for each meal, were analysed by paired t-tests and 2 × 2 repeated measures ANOVA.
RESULTS: HCT resulted in lesser suppression of ΔFOR (p = 0.02) and a significantly greater DIT (p = 0.01). Further, the buffet to dinner interval was prolonged (p = 0. 083) and reported 24 h energy intake following this trial was significantly reduced (p = 0.017). ∆leptin following HCT but not LCT was negatively related to 24 h fat intake (r = -0.81, p = 0.016).
CONCLUSIONS: Higher calcium and vitamin D intake at a breakfast meal acutely increased postprandial FOR and DIT over two successive meals, and reduced spontaneous energy intake in the subsequent 24 h period. Australian New Zealand Clinical Trials Registry (ANZCTR) number: ACTRN12609000418279.
Copyright © 2010 Elsevier Ltd and European Society for Clinical Nutrition and Metabolism. All rights reserved.
PMID: 21276644 [PubMed - as supplied by publisher]


Interessante

[jim_a]

praticamente la cosa piu interesante e il grafico B (insulina) e i grafici C e D (lipolisi)....



mi sa che lyle mcd lo sapeva prima....

[gian90]

Effect of calcium from dairy and dietary supplements on faecal fat excretion: a meta-analysis of randomized controlled trials.

Altro:
Christensen R, Lorenzen JK, Svith CR, Bartels EM, Melanson EL, Saris WH, Tremblay A, Astrup A.
The Parker Institute, Musculoskeletal Statistics Unit, Frederiksberg Hospital, Frederiksberg, Denmark.
Abstract

Observational studies have found that dietary calcium intake is inversely related to body weight and body fat mass. One explanatory mechanism is that dietary calcium increases faecal fat excretion. To examine the effect of calcium from dietary supplements or dairy products on quantitative faecal fat excretion, we performed a systematic review with meta-analysis. We included randomized, controlled trials of calcium (supplements or dairy) in healthy subjects, where faecal fat excretion was measured. Meta-analyses used random-effects models with changes in faecal fat excreted expressed as standardized mean differences, as the studies assessed the same outcome but measured in different ways. An increased calcium intake resulted in increased excretion of faecal fat by a standardized mean difference of 0.99 (95% confidence intervals: 0.63-1.34; P < 0.0001; expected to correspond to approximately 2g day(-1)) with moderate heterogeneity (I(2) = 49.5%) indicating some inconsistency in trial outcomes. However, the dairy trials showed homogeneous outcomes (I(2)=0%) indicating consistency among these trials. We estimated that increasing the dairy calcium intake by 1241 mg day(-1) resulted in an increase in faecal fat of 5.2 (1.6-8.8) g day(-1). In conclusion, dietary calcium has the potential to increase faecal fat excretion to an extent that could be relevant for prevention of weight (re-)gain. Long-term studies are required to establish its potential contribution.

[Guru]

Si però, in riferimento al secondo studio, non vorrei si finisse con l'avere "perdite" come succedeva con quella schifezza dell'orlistat.

Inoltre mi chiedo quanto possa influire sul peso una perdita di pochi grammi di grassi, senza contare che uno sportivo segue mediamente una dieta più salubre con meno grassi saturi.

[LiborioAsahi]

Senza contare che la perdita di grassi può voler dire anche perdita di nutrienti liposolubili.