Metabolic Availability of Methionine From Mung Beans in Healthy Adults

The research study is being done so we can determine the quality of the protein present in Mung beans. Amino acids are the building blocks of protein and protein quality is determined by the amount of amino acids present and by their bioavailability (their absorption and use by the body). Some amino acids are essential which means they must be obtained from the diet. If any one of the essential amino acids is missing in the diet, the body cannot make proteins that are used to repair tissue build bone, teeth, etc... Mung beans as a food source contain low amounts of the essential amino acid methionine which makes its protein incomplete. The amino acids in Mung beans are also affected by cooking. Our objective is to determine the amount of methionine in Mung beans that the body can use. We will test Mung beans by studying them after cooking them in a stew, on their own and by combining the Mung bean stew with rice or wheat in a mixed meal to make a more complete protein.

This research is being done in order to bridge the gap between knowledge of protein requirement and the amount of food needed to meet that requirement. Results from this study will be important for recommendations guiding food choices of Mung bean as a major protein source in the diet.

Previously the quality of dietary protein for human consumption was studied in animals. This study is being done in humans because studies in animals are not directly applicable to humans. Plant protein sources like Mung beans are important alternatives to animal protein in the diet. Plant protein consumption relative to animal protein can contribute to "enhance ecosystem resilience, and improved human health.

If you agree to take part in this study, you will receive 3 different amounts of Mung beans which will contain different amounts of the essential amino acid methionine as well as 3 different amount of Mung beans complemented with rice or wheat. The Mung beans will be cooked in a stew served on its own or served with the rice or wheat. The quality of the protein in the Mung beans will be compared to the quality of a reference protein (egg protein) by giving you 4 reference diets containing amino acids patterned after the amino acid content of egg protein. The amount of Mung beans you receive will be provided in a random order.

Breath samples will be collected after the 4th meal in 15 min intervals for 1 hour. Breath collection will resume again two and a half hours after the 5th meal every 15 minutes until 30 minutes after the last meal. A total of 52 breath samples will be collected during each of the 3rd study day.

Eligibility Criteria:
Inclusion Criteria:

* Male, age 18 - 49 yrs, Healthy with no known clinical condition which would affect protein or AA metabolism, ex. Diabetes, Stable Body Weight (no more than 5 lb weight loss or gain in the past 3 months) Not on any medications that could affect protein or amino acid metabolism e.g. steroids

Exclusion Criteria:

* Unwillingness to participate or unable to tolerate the diet Recent history of weight loss within the last 3 months or on a weight reducing diet Inability to tolerate study diets (ex. Allergy to ingredients).