Mood swings or increased nervousness aren't always emotional. Sometimes, it's simply dehydration that disrupts overall balance.
The effects on digestion and the body

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Frequent cravings for snacks
Thirst can be mistaken for hunger. Before giving in to a snack, drink a glass of water and wait a few minutes.
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Slow transit
Water contributes to more comfortable digestion. A lack of it can make bowel movements slower and less pleasant on a daily basis.
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Muscle stiffness and discomfort
Regular hydration contributes to the overall flexibility of the body, especially if you move a lot or in hot weather.
Why dehydration sets in silently

Contrary to popular belief, you don't need to feel intensely thirsty to be dehydrated. Many women drink too little out of habit, lack of time, or simply forgetfulness. Because the effects appear gradually, they are often attributed to other causes.