Lifestyle, Exercise and Nutrition Study 2 (LEAN 2) (LEAN 2)

BMI will be calculated using weight and height measurements (weight (kg)/height (m)^2 ). Weight and height will be measured by research staff blinded to the participant's randomization group at baseline and 6-months. Participants will be weighed in light indoor clothing, without shoes, rounding up to the nearest 0.1 kg; height will be measured in a standard manner, without shoes, using a stadiometer, rounding up to the nearest 0.1 cm. All measures will be performed and recorded twice in succession.

Participants will be weighed in light indoor clothing, without shoes, rounding up to the nearest 0.1 kg. All measures will be performed and recorded twice in succession.

Dual Energy X-Ray Absorptiometry (DEXA) scans will be performed at baseline and 6-months. The DEXA measurements will be made with a Hologic scanner (Hologic 4500 with a "Discovery" upgrade, Hologic Inc, Waltham, Mass). A whole-body scan takes approximately 10 minutes to complete. We will measure percent body fat utilizing DEXA.

We will collect a breast tissue biopsy from the unaffected breast at baseline and 6 months. Six slides will be made from each specimen for immunohistochemistry, as follows: Ki67 (MIB-1, DAKO), IGF1 receptor (1D5; DAKO), insulin receptor (mouse anti-human monoclonal B1445; LifeSpan BioSciences), Estrogen receptor (SP1, NeoMarker), Progesterone receptor (pgR636, DAKO) and HER-2 neu (SP3, NeoMarker). Ki67 will be scored quantitatively (% positive nuclei) using the Aperio system (Specialized Histopathology Laboratory). Estrogen and progesterone receptors will be scored following current ASCO/CAP guidelines (percent positive, intensity). Her2 will be scored according to current ASCO/CAP guidelines (intensity of membrane staining). All other markers will be scored on a semi-quantitative scale (0 to 3+).

All the hormones to be measured (insulin, IGF-1, leptin, adiponectin and C-reactive protein) have been previously measured in our lab and published. We will use immunoassay techniques and kits from Diagnostic Products Corporation (DPC, Los Angeles, CA) to measure each hormone value. Each woman's baseline and follow-up samples will be used in the same batch, and an equal number of intervention and control samples will also be included in the same batch. Blind duplicates are also included in and between batches to estimate coefficient of variations.

All the hormones to be measured (insulin, IGF-1, leptin, adiponectin and C-reactive protein) have been previously measured in our lab and published. We will use immunoassay techniques and kits from Diagnostic Products Corporation (DPC, Los Angeles, CA) to measure each hormone value. Each woman's baseline and follow-up samples will be used in the same batch, and an equal number of intervention and control samples will also be included in the same batch. Blind duplicates are also included in and between batches to estimate coefficient of variations.

All the hormones to be measured (insulin, IGF-1, leptin, adiponectin and C-reactive protein) have been previously measured in our lab and published. We will use immunoassay techniques and kits from Diagnostic Products Corporation (DPC, Los Angeles, CA) to measure each hormone value. Each woman's baseline and follow-up samples will be used in the same batch, and an equal number of intervention and control samples will also be included in the same batch. Blind duplicates are also included in and between batches to estimate coefficient of variations.

Assessment of skin carotenoids will be done using Resonance RAMAN Spectroscopy (RRS). Briefly, a small scanner which shines blue light is placed on the palm of the hand for 30 seconds. The palm is cleaned with an alcohol wipe prior to the scan, A RRS reading is available after a further 30 seconds. The procedure is repeated at the same body location. Skin color is self assessed by the participants at the baseline visit using samples that are used in plastic surgery to assess skin color. Melanin content (skin color) may have a small effect on RRS, but this effect is minimized by assessing skin carotenoids in the palm, which has a lower melanin content than other body sites.

A mailed follow up will be conducted at 12-months post randomization. Questionnaires will be mailed to the participant with a pre-paid envelope for their return. Information about current weight will be collected using this method.

Women will be asked to collect 3 saliva samples (wake up, midday and bedtime) for 4 days following the baseline biopsy visit and 6 month follow up visit. Samples will be collected using Salivettes for cortisol. The cotton ball is removed from the Salivette, chewed for 1 minute and returned to the Salivette. Samples will be refrigerated in the container provided. Samples will be returned by mail in a specialized self-addressed pre-paid envelope when sample collection is complete.