This study is a nutrition research study designed to look at how healthy meals can influence the content of breast milk. Moms will be provided with meals that follow a Mediterranean diet pattern for 4 weeks. The goal of the study is to see if breast milk content changes over the 4 week period. The infants of the moms will also be included in the study to measure any changes in growth.

Inclusion Criteria:

• ≤4.5 months postpartum
• BMI 30 - 50 kg/m2
• ≥ 18 years of age
• Singleton pregnancy
• Exclusive breastfeeding and plans to exclusively breastfeed for at least 6 months postpartum
• Mother has a breast pump
• Mother is willing to collect breast milk for a 24 hour period.

Exclusion Criteria:

• Pre-existing conditions (e.g. diabetes, hypertension, heart disease)
• Use of recreational drugs, tobacco, or alcohol
• Use of medications or supplements for which breastfeeding is contraindicated
• Child has internal metal which may be an NMR safety concern

Participants must be breastfeeding.