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Regulation of adiposity by dietary calcium

Zemel, Michael B., Shi, Hang, Greer, Betty, Dirienzo, Douglas, Zemel, Paula C.·2000·The FASEB Journal
DOI 10.1096/fasebj.14.9.1132
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Abstract

Recent data from this laboratory demonstrate that increasing adipocyte intracellular Ca 2+ results in a coordinated stimulation of lipogenesis and inhibition of lipolysis. We have also noted that increasing dietary calcium of obese patients for 1 year resulted in a 4.9 kg loss of body fat ( P <0.01). Accordingly, we tested the possibility that calcitro‐phic hormones may act on adipocytes to increase Ca 2+ and lipid metabolism by measuring the effects of 1,25‐(OH) 2 ‐D in primary cultures of human adipocytes, and found significant, sustained increases in intracellular Ca 2+ and a corresponding marked inhibition of lipolysis (EC 50 ~50 pM; P<0.001), suggesting that dietary calcium could reduce adipocyte mass by suppressing 1,25‐(OH) 2 ‐D. To test this hypothesis, we placed transgenic mice expressing the agouti gene specifically in adipocytes on a low (0.4%) Ca/high fat/high sucrose diet either unsupplemented or with 25 or 50% of the protein replaced by non‐fat dry milk or supplemented to 1.2% Ca with CaCO 3 for 6 wk. Weight gain and fat pad mass were reduced by 26–39% by the three high calcium diets ( P <0.001). The high calcium diets exerted a corresponding 51% inhibition of adipocyte fatty acid synthase expression and activity ( P < 0.002) and stimulation of lipolysis by 3.4‐ to 5.2‐fold ( P < 0.015). This concept of calcium modulation of adiposity was further evaluated epi‐demiologically in the NHANES III data set. After controlling for energy intake, relative risk of being in the highest quartile of body fat was set to 1.00 for the lowest quartile of Ca intake and was reduced to 0.75, 0.40, and 0.16 for the second, third, and fourth quartiles, respectively, of calcium intake for women ( n =380;P≪ 0.0009); a similar inverse relationship was also noted in men ( n =7114; P< 0.0006). Thus, increasing dietary calcium suppresses adipocyte in‐tracellular Ca 2+ and thereby modulates energy metabolism and attenuates obesity risk.—Zemel, M. B., Shi, H., Greer, B., DiRienzo, D., Zemel, P. C. Regulation of adiposity by dietary calcium. FASEB J . 14, 1132–1138 (2000)

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Authors
Zemel, M. B., Shi, H., Greer, B., Dirienzo, D., & Zemel, P. C.
Venue
The FASEB Journal
Publisher
Wiley
Published
2000-06
Volume
14
Issue
9
Pages
1132-1138
ISSN
  • 0892-6638 (ISSN-L)
  • 1530-6860
DOI
10.1096/fasebj.14.9.1132
OpenAlex
W1932116449
Cited by
968
References
0
FWCI
16.00
Type
journal article
Language
en
Open access
closed

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