Lactic acid can build up in the body during strenuous running training, which can change the taste of breast milk.
Many women have questions, concerns, and doubts regarding exercise while breastfeeding. Is it okay? Will it affect my milk supply? Will it change the taste of my milk? Will it affect the baby? And the list goes on.
Here are four important facts to know that'll put your mind at ease:
Exercise won't hurt your milk supply. As long as you maintain a healthy diet, your milk supply should not be affected by exercise. Your body burns about 500 calories per day to produce the milk your baby needs. If you are exercising a lot, you have to make up for the extra calories expended.
It won't change the taste, either. Some old wives' tales caution against too much exercise because it makes your milk sour so that babies won't want to feed. It turns out there may be some truth to that belief. Studies have shown that lactic acid levels in breast milk are significantly elevated for up to 90 minutes after maximal exercise, which may adversely alter the flavor of the milk.
The good news is that there is no such elevation in lactic acid levels after moderate activity. So as long as you keep your aerobic exercise in the 80% of maximal heart rate range, your baby won't notice a difference. Since you may sweat while working out, be sure to shower or at least wipe off your nipples or they may taste salty!