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Calcium: Collard greens

How eating calcium helps: Found in a variety of sources (nondairy included), calcium is often paired with Vitamin D to help regulate mood fluctuations attributed to PMS. Since estrogen plays a large role in calcium production, calcium consumption may improve PMS-related depression.Recommended Daily Allowance, or RDA: 1,000 mg per day for adultsCollard greens, frozen (1 cup): 357 mgMichael Tercha / Chicago Tribune