How does breastfeeding affect postpartum weight loss?
Breastfeeding increases daily energy demands, often requiring several hundred additional calories to support milk production. While some women experience gradual weight loss during this time, others find fat loss slower than expected. Hormones involved in lactation, particularly prolactin, can encourage the body to retain fat as a protective mechanism to ensure a stable energy supply.
Restrictive dieting during breastfeeding is generally discouraged, as aggressive calorie deficits may affect energy levels and, in some cases, milk supply. A more supportive approach focuses on regular meals, adequate protein, whole foods, and consistent hydration.
Weight changes during breastfeeding vary widely and do not reflect effort or discipline. For many women, fat loss becomes more noticeable once feeding patterns change and hormonal demands reduce. Patience and nutritional adequacy are key during this phase.
References and further reading
ABOUT THE AUTHOR
Coach Alan is a qualified ITEC Level 3 Personal Trainer with over 9 years of coaching experience in health and fitness. He is also the founder of Mind Body Training, where his work focuses on sustainable fat loss, strength training, and long-term behavioural change for adults.
Alan is also a psychotherapist-in-training with the Irish Institute of Counselling and Psychotherapy (IICP). His approach is informed by evidence-based principles from exercise science, nutrition and psychology, with an emphasis on realistic habit formation and stress-aware lifestyle change.