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Metallic taste after long - distance running results from RBC breakdown, oxidative stress, air particles, and psycho - hormonal factors.
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Eye color may change slightly with age due to internal (melanin, structure) & external (sun, meds) factors.
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The ability to smell pre - rain scent varies due to biological (genes, receptors) and environmental (exposure, health) factors.
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Daily water intake varies by diet, activity, environment, and individual factors, listen to your body.
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Digestive biscuits were meant to aid digestion but modern ones with high sugar, fat may not live up to it.
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