Should cows milk be avoided during periods of heavy exertion?
Assuming you are not lactose intolerant, does milk have any specific negative effects on you during heavy exertion?
We're not talking about milk calories or fat related to weight loss. Does milk itself contain components that would affect your performance, to an extent that milk should be avoided?
For example, say someone participates in a high-school marching band where they practice drills outdoors for 6-8 hours a day, 5 days a week during practice season. This is outdoors during the summer, with temperatures in the 80s-90s Fahrenheit. I've heard that milk "curdles" in your stomach during long periods of heavy exertion and can cause nausea. This seems implausible to me.
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One possible risk is that milk can thicken your phlegm (although it doesn't actually make you produce more), which may create difficulty as you begin to breathe more heavily, because you'll have to either breathe through the phlegm or cough it up and spit it out.
More speculative, while I don't see the milk simply "curdling" in your stomach, you might run into mild symptoms similar to lactose intolerance due to your body directing blood away from your stomach, meaning less of the milk is being digested.
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