Novel Metabolites of Beta-Carotene and Lycopene

Participants will receive high beta-carotene tomato juice daily in addition to the base diet. Meals will be prepared using traditional American foods with a macronutrient composition representative of a typical American diet. The base diet will be low in betacarotene and lycopene (no carrots, sweet potato, tomatoes, and dark greens). During the controlled diet period, participants will be instructed to eat all foods and only foods provided to them, with the exception of water, coffee, tea, and diet soda.

Participants will receive high lycopene tomato juice daily in addition to the base diet. Meals will be prepared using traditional American foods with a macronutrient composition representative of a typical American diet. The base diet will be low in betacarotene and lycopene (no carrots, sweet potato, tomatoes, and dark greens). During the controlled diet period, participants will be instructed to eat all foods and only foods provided to them, with the exception of water, coffee, tea, and diet soda.

Participants will receive a placebo beverage daily in addition to the base diet. Meals will be prepared using traditional American foods with a macronutrient composition representative of a typical American diet. The base diet will be low in betacarotene and lycopene (no carrots, sweet potato, tomatoes, and dark greens). During the controlled diet period, participants will be instructed to eat all foods and only foods provided to them, with the exception of water, coffee, tea, and diet soda.