Effect of Lactose on Blood Lipids

Inclusion Criteria: • Age: 18-50 years and premenopausal (for women) Exclusion criteria: * Weight instability (\>5 kg change in body mass within last 6 months) * Diagnosis of any form of diabetes * Intolerances or allergies to any of the study procedures (e.g. lactose intolerance) * Galactose disorders (e.g. galactokinase deficiency, UDPgalactose-4-epimerase deficiency, galactose-1-phosphate uridyl transferase deficiency) * Fructose malabsorption * Inborn errors of fructose metabolism (e.g. fructokinase deficiency, aldolase B deficiency, fructose-1,6-bisphosphatase deficiency) * Pregnant or lactating * Any condition that could introduce bias to the study (e.g. diagnoses of lipid disorders, including cardiovascular disease, or therapies that alter lipid or glucose metabolism, such as statins or niacin).