The purpose of the proposed study is to evaluate the impact of the Jump Start program to facilitate weight loss in a sample of overweight and obese men and women. The study will not only evaluate weight loss and changes in body-shape but will also assess the type of weight lost (fat vs. lean mass) and other health measures affected by obesity including lipids, glucose, insulin, resting heart rate and blood pressure, and perceived wellness. This study will contribute to the general weight loss literature by providing evidence for or against the use of a meal replacement centered one-week weight loss program to yield weight loss and other health-specific benefits. The hypothesis is that the Jump Start program will result in an average 3-5 pound weight loss, as well as improvements in bloodborne markers of health, from day 1 to day 8.

Inclusion Criteria:

• BMI of 28-39.9 kg/m2
• can fast >10 hours
• maintain existing exercise regiment during study

Exclusion Criteria:

• Weight greater than 500 lbs
• Type I or II diabetic
• liver disease
• tobacco user
• adversity to fiber or protein supplement
• taking weight loss dietary supplements or adhering to any weight loss plan in the month prior to and during participation in the study
• taking a multi-vitamin or pro-biotic, or if they were not recommended by a doctor, willing to stop for 4 weeks prior to the study.
• consumption of alcohol or caffeine within 24 hours of each testing visit
• strenuous exercise during the 24 hours period before each testing visit
• self-reported active infection or illness of any kind
• pregnant or lactating