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Abstract

Background: Milk fermented with Lactobacillus helveticus ( L. helveticus) has been shown to lower blood pressure and to increase bone mineral content in spontaneously hypertensive rats. The effect of L.helveticus may be due to better calcium availability.

Aim of the study: In the present study the effect of milk fermented with L. helveticus on acute changes in calcium metabolism and bone resorption in postmenopausal women was studied.

Methods: The study was performed as a randomised double-blind crossover study of 20 postmenopausal women (mean age 65, range 50-78). The study was carried out in two parts. Firstly, L. helveticus fermented milk was compared to a control milk. Secondly, juice containing peptides formed with L. helveticus bacteria was compared to a control juice. The acute effect on calcium metabolism was measured during the study day by serum ionised calcium (iCa), parathyroid hormone (PTH), calcium (Ca), phosphate (P), and urinary calcium. A direct marker of bone turnover, carboxyterminal telopeptide of type I collagen (ICTP), was measured from the serum.

Results: L. helveticus fermented milk reduced serum PTH (405.3 +/- 37 ng/l vs. 454.9 +/- 37, p = 0.012) and increased serum calcium (19.1 +/- 0.2 mmol/l vs. 18.8 +/- 0.2, p = 0.031) compared to the control milk. L. helveticus derived peptides had no significant acute effect on calcium metabolism, in fact, ionised calcium was lower and PTH higher after the juice containing peptides compared to the control juice.

Conclusions: Fermentation of milk with Lactobacillus helveticus had a positive acute effect on calcium metabolism. This effect was not explained by the small peptides formed by L. helveticus.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lactobacillus helveticusElevated Serum Calcium LevelsBeneficial
Moderate
Lactobacillus helveticusReduced Parathyroid Hormone LevelsBeneficial
Moderate
Lactobacillus helveticus HA-128Improved Calcium MetabolismBeneficial
Moderate
Lactobacillus helveticus HA-128No Significant Acute Effect on Calcium MetabolismNeutral
Small
Lactobacillus helveticus L10Increased Serum Calcium LevelsBeneficial
Small
Lactobacillus helveticus L10Reduced Serum PTH LevelsBeneficial
Moderate
Lactobacillus helveticus LH76Increased Serum Calcium LevelsBeneficial
Small
Lactobacillus helveticus LH76No Significant Acute Effect on Calcium MetabolismNeutral
Small
Lactobacillus helveticus LH76Reduced Parathyroid Hormone LevelsBeneficial
Moderate
Lactobacillus helveticus Rosell-52Elevated Serum Calcium LevelsBeneficial
Moderate
Lactobacillus helveticus Rosell-52No Significant Acute Effect on Calcium MetabolismNeutral
Small
Lactobacillus helveticus Rosell-52Reduced Parathyroid Hormone LevelsBeneficial
Moderate
Lactobacillus helveticus Rosell-52NDElevated Serum Calcium LevelsBeneficial
Moderate
Lactobacillus helveticus Rosell-52NDReduced Parathyroid Hormone LevelsBeneficial
Moderate
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