If you reach for whatever water feels convenient each morning, you may be missing how powerfully temperature shapes the way your body wakes up. Some people grab a cold glass for an instant hit of freshness, while others instinctively prefer warm water to ease the stomach and support digestion. Since hydration influences everything from bowel movement to mental clarity, the debate around hot water vs cold water is more meaningful than it seems. Your morning drink is the first signal your body receives about how to start functioning for the day. A peer-reviewed study published in Nutrients examined how hot water vs cold water affects digestion using ultrasound to measure gastric motility. Researchers found that cold water slowed gastric contractions and reduced subsequent energy intake,

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