Individualized Dietary Intervention in Breastfeeding Women: body Weight and Vitamin A Stores

This protocol was approved by the Bioethics Committee of the Department of Medicine and Health Sciences of Universidad de Sonora. A randomized controlled trial will be carried out and participant women will be assigned by simple randomization 1:1 to either the intervention or control group, upon signing an informed consent. At baseline (2wk postpartum), anthropometric (weight, height, mid upper‐arm circumference and triceps skinfold thickness) and body composition (DXA) measurements as well as the assessment of vitamin A status (serum and breastmilk retinol and the modified relative dose response) will be performed. The control group will receive only recommendations for a healthy diet in accordance with international standards and will be followed up every month to promote adherence and to assess their nutritional status. On the other hand, the intervention group will receive an individualized macronutrient meal equivalent menu, with nutritional consultations every two weeks. The dietary plan will include 1‐1.5 g/kg body weight protein, 30% total fat (preferably mono and polyunsaturated fatty acids), and vitamin A sources (1300 RAE). After 3 months of intervention are completed, baseline measurements will be repeated. Statistical analysis will include descriptive stats and comparisons between groups (t‐tests), significance will be defined as P < 0.05.