This study was suspended due to additional time needed for method development.

The study will consist of a single 5-day dietary treatment period. Subjects will consume an Allium-free diet for 3 days. Alliums are vegetables such as garlic, onions, chives, shallots, and leeks. On day 4, subjects will consume a breakfast consisting of garlic and will then provide blood and urine samples for 10 hours, and on the following morning.

Inclusion Criteria:

• Men and women of age 25 to 75 years at beginning of study
• BMI between 18.5 and 30 kg/m2
• Fasting glucose < 126 mg/dl
• Blood pressure < 160/100 (controlled with certain medications)
• Fasting total blood cholesterol < 280 mg/dl
• Fasting triglycerides < 300 mg/dl

Exclusion Criteria:

• Younger than 25 years old or older than 75 years old
• Use of blood-thinning medications such as Coumadin (warfarin), Dicumarol (dicumarol), or Miradon (anisindione)
• Presence of kidney disease, liver disease, gout, certain cancers, thyroid disease, gastrointestinal, other metabolic diseases or malabsorption syndromes.
• Have been pregnant during the previous 12 months, are currently pregnant or lactating, or plan to become pregnant during the study
• Type 2 diabetes requiring the use of oral antidiabetic agents or insulin
• History of eating disorders or other dietary patterns which are not consistent with the dietary intervention (e.g., vegetarians, very low fat diets, high protein diets)
• Use of prescription or over-the-counter antiobesity medications or supplements (e.g., phenylpropanolamine, ephedrine, caffeine) during and for at least 6 months prior to the start of the study or a history of a surgical intervention for obesity
• Active cardiovascular disease (such as a heart attack or procedure within the past three months or participation in a cardiac rehabilitation program within the last three months, stroke, or history/treatment for transient ischemic attacks in the past three months, or documented history of pulmonary embolus in the past six months).
• Use of any tobacco products in past 6 months
• Unwillingness to abstain from herbal supplements for two weeks prior to the study and during the study
• Known (self-reported) allergy or adverse reaction to garlic
• Inability to tolerate garlic
• Unable or unwilling to give informed consent or communicate with study staff
• Self-report of alcohol or substance abuse within the past twelve months and/or current acute treatment or rehabilitation program for these problems (Long-term participation in Alcoholics Anonymous is not an exclusion)
• Other medical, psychiatric, or behavioral factors that in the judgment of the Principal Investigator may interfere with study participation or the ability to follow the intervention protocol