The Effect of Calcium on Postprandial Lipid Profile and Appetite

Study Overview
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Brief Summary
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The purpose of this study is to investigate the effect of calcium on postprandial lipid profile and appetite.

Detailed Description
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Several reports have found inverse associations between calcium intake and body weight. Intervention studies have shown that a high calcium diet resulted in a greater body weight loss than a low calcium diet. In addition, it seems that calcium from dairy products have a more profound effect than calcium from supplements. The mechanism of this additional dairy effect is not yet clear, but one possible explanation could be reduced absorption of fat in the gut. The increase in fecal fat excretion on a high calcium diet could be due to the formation of calcium-fatty acid soaps in the gut. The long term effect of a high calcium intake have been under intense investigation, but as far as we know the acute effect of a high calcium intake have not yet been examined. A study concerning the acute effects could help us understand the effect of calcium on the absorption of fat. After a meal triglyceride (TG) is packaged with cholesterol, lipoproteins and other lipids into particles called chylomicrons. Earlier studies have shown that the fatty acid pattern of chylomicron lipids postprandial was very similar to that of the ingested fat. If we assume that calcium inhibits the absorption of fat, we would expect a reduced total plasma triglyceride concentration after a calcium-rich meal. Appetite involves many different sensations among which hunger and satiety are the most investigated. Several different hormones are involved in the regulation of appetite. Some of these hormones are known to respond to the intake or absorption of fat. If the absorption of fat is inhibited the regulation of appetite most likely will be affected. In the long term this could be important because an increased appetite probably would increase energy intake and thereby reducing the weight loss we otherwise might have accomplished by the reduced absorption of fat.

Conditions
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Obesity

Intervention / Treatment
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* Behavioral: high calcium intake


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy meals BMI 24-31 kg/m2 age between 18-50 years hemoglobin >8 mmol/L Exclusion Criteria: donation of blood 6 months before and under the study milk allergy, diabetes, hypertension, hyperlipidemia, cronic infectious disease use of dietary supplements 3 months before and under the study smoking elite athletes use of medication

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 50 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Behavioral: high calcium intake|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Postprandial changes in: total plasma triacylglyceride; Chylomicron triacylglyceride; Cholesterol |  |  | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Postprandial changes in:insulin; glucose; CCK; Ghrelin; GLP-1, appetite measured by visual analogue scales, BCAA |  |  | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Obesity, Calcium, Fat absorption, Postprandial lipid profile, appetite