Can You Fast While Breastfeeding? What Nursing Parents Should Know
Note: This article is for educational purposes only and isn't a substitute for medical advice.
Can you fast while breastfeeding?
The short answer: It depends.
Many healthy breastfeeding parents can safely participate in short-term religious fasts, but fasting isn't the right choice for everyone. Your baby's age, your milk supply, your overall health, and the type and length of the fast all matter.
If your baby isn't gaining weight well, you're struggling with milk production, or you have a medical condition such as diabetes, talk with your healthcare provider before fasting. Likewise, if you're considering intermittent fasting or fasting for weight loss, most experts recommend waiting until breastfeeding is well established.
While your body is remarkably good at protecting breast milk production, breastfeeding places significant demands on your energy and nutrient stores. Supporting your own health helps support your breastfeeding journey.
How breastfeeding changes your nutritional needs
Breastfeeding requires extra calories, fluids, and nutrients to produce milk and support your own recovery after pregnancy. According to the Centers for Disease Control and Prevention (CDC), parents who are exclusively breastfeeding generally need an additional 330 to 400 calories per day, depending on their activity level and how much milk they're producing.
Rather than focusing on strict calorie counting, aim to:
Eat regular, balanced meals.
Include protein, healthy fats, whole grains, fruits, and vegetables.
Drink enough fluids to satisfy your thirst.
Listen to your body's hunger cues.
It's common to feel hungrier while breastfeeding—and for good reason.
Does fasting affect breast milk?
For most healthy breastfeeding parents, a short-term fast isn't likely to permanently reduce milk supply. Research suggests that temporary fasting may cause small changes in the composition of breast milk, but these changes generally aren't harmful to healthy, full-term infants. However, fasting can affect you before it affects your milk.
Some parents may experience:
fatigue
headaches
dehydration
dizziness
increased hunger
reduced energy
If dehydration becomes significant, some parents may notice a temporary decrease in milk production. Once hydration and nutrition are restored, milk supply typically rebounds.
Every breastfeeding experience is different. If you notice your baby nursing more frequently than usual, producing fewer wet diapers, or not gaining weight appropriately, contact your pediatrician or lactation consultant.
Religious fasting while breastfeeding
Many faith traditions recognize that pregnancy and breastfeeding create unique nutritional needs. Some religions exempt breastfeeding parents from fasting altogether. Others allow modified fasting or offer exemptions when fasting could affect the parent's or baby's health.
For example:
Islam allows pregnant and breastfeeding women to postpone fasting during Ramadan if fasting may harm them or their child.
Judaism provides exemptions from some fasts for breastfeeding parents, depending on the specific observance and individual circumstances.
Some Christian traditions, including Catholicism, exempt pregnant and nursing mothers from required fasting during Lent.
Religious guidance varies by faith and community. If you're unsure how fasting applies to your situation, speak with both your healthcare provider and your faith leader.
Breastfeeding during Ramadan
Ramadan presents a unique situation because fasting occurs daily from dawn until sunset for approximately one month. Several studies have found that Ramadan fasting generally does not negatively affect infant growth or overall breast milk production in healthy breastfeeding parents. However, fasting may temporarily affect maternal nutrient stores and certain vitamins and minerals.
If you choose to observe Ramadan while breastfeeding, consider these strategies:
Eat a balanced Suhoor (pre-dawn meal) with protein, healthy fats, fiber, and complex carbohydrates to help sustain energy throughout the day.
Include foods like eggs, Greek yogurt, nut butter, oatmeal, beans, whole grains, fruits, and vegetables.
Rehydrate well between sunset and dawn.
Break your fast with nutrient-dense foods rather than relying primarily on sweets or highly processed snacks.
Prioritize rest whenever possible.
As always, pay attention to how you're feeling. If fasting causes dizziness, severe fatigue, or signs of dehydration, consult your healthcare provider.
What to eat before and after a fast
Whether you're fasting for religious reasons or another purpose, nourishing your body before and after the fast can help support both your health and breastfeeding.
Before fasting
Choose foods that digest slowly and provide lasting energy, including:
eggs
yogurt
beans or lentils
whole grains
nuts and seeds
avocado
fresh fruit
vegetables
After fasting
When it's time to eat again, focus on rebuilding energy with nutrient-dense foods. Good options include:
lean proteins
legumes
roasted vegetables
sweet potatoes
brown rice
soups
healthy fats like olive oil or avocado
While desserts and refined carbohydrates can be tempting after fasting, pairing them with protein and fiber helps maintain more stable energy levels.
Staying hydrated while breastfeeding
Hydration is especially important when you're breastfeeding. Rather than recommending a specific number of ounces each day, the CDC advises breastfeeding parents to drink enough water and other healthy beverages to satisfy thirst.
Signs you may need more fluids include:
dark-colored urine
feeling thirsty
dry mouth
headache
fatigue
If you're fasting, make hydration a priority during the hours when drinking is permitted.
When you should avoid fasting
It may be safest to postpone fasting if:
your baby isn't gaining weight appropriately
your milk supply is already low
your healthcare provider has concerns about your baby's growth
you're recovering from childbirth or illness
you have diabetes or another medical condition requiring regular meals
you're feeling faint, dizzy, or dehydrated
Remember: caring for your own health is part of caring for your baby.
Frequently Asked Questions
Can intermittent fasting affect breast milk?
Research on intermittent fasting during breastfeeding is limited. Because breastfeeding requires additional calories and nutrients, many healthcare providers recommend waiting until breastfeeding is well established—or until you've finished breastfeeding—before trying intermittent fasting for weight loss.
Will fasting dry up my milk supply?
Usually not. A short-term fast isn't likely to permanently reduce milk production in healthy breastfeeding parents. However, dehydration or prolonged calorie restriction may temporarily reduce supply.
How much water should breastfeeding moms drink?
There's no one-size-fits-all recommendation. The CDC advises breastfeeding parents to drink enough fluids to satisfy thirst, since fluid needs vary based on activity level, climate, and individual health.
Is it safe to fast while exclusively breastfeeding?
Some parents can safely participate in short-term religious fasts while exclusively breastfeeding, but it's important to consider your baby's age, weight gain, and your own health. If your baby is very young or you're concerned about milk supply, talk with your healthcare provider before fasting.
The bottom line
Choosing whether to fast while breastfeeding is a personal decision that’s shaped by your health, your baby's needs, and your religious beliefs. For many healthy parents, short-term fasting can be done safely with careful planning, balanced nutrition, and plenty of hydration when eating and drinking are permitted. But if fasting leaves you feeling unwell or affects your baby's feeding or growth, your health should come first. When in doubt, your healthcare provider, pediatrician, lactation consultant, and faith leader can help you make the decision that's right for you.
Mamava designs solutions to empower breastfeeding and pumping parents on the go, like our freestanding lactation pods, Mamava’s lactation space locator app, and other helpful resources.
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