Breastfeeding increases energy needs by approximately 400–500 kcal/day above pre-pregnancy requirements, making it one of the most nutrient-demanding states in a woman’s life. These needs are best met through eating a varied, wholefood diet rather than relying heavily on supplements.
Protein requirements rise to around 1.1 g/kg/day. Hydration is critical — producing roughly 750 ml of milk daily increases fluid needs considerably; the most practical guide is drinking to thirst and monitoring urine colour.
Key micronutrients: Vitamin B12 — deficiency in the mother directly reduces milk B12 and puts the infant at neurological risk; vegans and vegetarians need to supplement reliably. Choline is essential for infant brain development; eggs, meat, and fish are the richest sources, and many breastfeeding supplements omit it. Vitamin D supplementation (400 IU/day for the infant is separately recommended in many guidelines; maternal dose does not reliably protect the baby through milk alone). Iodine (iodised salt, dairy, eggs) also passes through milk.
Avoid unnecessary restriction of food groups during breastfeeding. Speak with a registered dietitian if you have concerns about milk supply, infant growth, or managing weight during lactation.