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People with poor insulin sensitivity do not respond normally to elevations in blood sugar. This may increase their risk of developing diabetes in the future. The purpose of this research study is to determine if the nutrient betaine, found in beets, spinach and wheat products, can enhance the production of fetal growth factor 21 (FGF21), a molecule that is believed to promote insulin sensitivity.
AIM: To determine if betaine is a modulator of FGF21 in humans. Low plasma betaine is associated with an increased risk of metabolic syndrome, but the mechanisms modulating this correlation are poorly delineated. Betaine bioavailability in humans is determined by dietary intake and genetic polymorphisms that influence betaine metabolism. Therefore, moderating betaine levels could be particularly beneficial for some individuals. FGF21 is elevated in response to insulin insensitivity and is under active investigation as a therapeutic modality. The mechanisms of action of FGF21 and betaine on insulin sensitivity in humans are incompletely understood. This study tests the hypothesis that betaine induces FGF21 secretion and insulin sensitizing actions in humans by measuring plasma FGF21, betaine, choline (betaine precursor), glucose, insulin and adiponectin in response to betaine supplementation over a 24 hour time course in 20 healthy, lean individuals. This pilot nutrition intervention will provide key preliminary evidence for understanding whether and how betaine exerts metabolic benefit in humans and will inform a future study to investigate the novel betaine-FGF21-insulin sensitivity axis in a larger cohort.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Betaine | Active Comparator | 6 gram dose of betaine delivered in encapsulated form |
|
| Dextrose | Placebo Comparator | 6 gram dose of dextrose delivered in encapsulated form |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Betaine | Dietary Supplement | 6 gram one-time dose of betaine delivered in encapsulated form with an unsweetened beverage |
|
| Measure | Description | Time Frame |
|---|---|---|
| Plasma Fetal Growth Factor 21 (FGF21) concentration | 0, 0.5, 1, 2, 4, 8, and 24 hours post- betaine or placebo supplement | |
| Plasma choline concentration | 0, 0.5, 1, 2, 4, 8, and 24 hours post- betaine or placebo supplement | |
| Plasma betaine concentration | 0, 0.5, 1, 2, 4, 8, and 24 hours post- betaine or placebo supplement | |
| Plasma glucose concentration | 0, 0.5, 1, 2, 4, 8, and 24 hours post- betaine or placebo supplement | |
| Plasma insulin concentration | 0, 0.5, 1, 2, 4, 8, and 24 hours post- betaine or placebo supplement | |
| Plasma adiponectin concentration | 0, 0.5, 1, 2, 4, 8, and 24 hours post- betaine or placebo supplement |
| Measure | Description | Time Frame |
|---|---|---|
| Typical dietary intake | Assessed via questionnaire | During day 2 of the first 3 day phase |
| Typical exercise habits | Assessed via questionnaire |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Karen Corbin, PhD, RD | UNC Nutrition Research Institute | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| UNC Nutrition Research Institute | Kannapolis | North Carolina | 28081 | United States |
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| ID | Term |
|---|---|
| D007333 | Insulin Resistance |
| ID | Term |
|---|---|
| D006946 | Hyperinsulinism |
| D044882 | Glucose Metabolism Disorders |
| D008659 | Metabolic Diseases |
| D009750 | Nutritional and Metabolic Diseases |
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| ID | Term |
|---|---|
| D001622 | Betaine |
| D005947 | Glucose |
| ID | Term |
|---|---|
| D050337 | Trimethyl Ammonium Compounds |
| D000644 | Quaternary Ammonium Compounds |
| D000588 | Amines |
| D009930 | Organic Chemicals |
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| Dextrose | Dietary Supplement | 6 gram one-time dose of dextrose delivered in encapsulated form with an unsweetened beverage |
|
| During day 2 of the first 3 day phase |
| D009861 |
| Onium Compounds |
| D006601 | Hexoses |
| D009005 | Monosaccharides |
| D000073893 | Sugars |
| D002241 | Carbohydrates |