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A teaching model, not a personal prescription. Sweat rate rises with activity and heat (about 0.1 to 1.6 L per hour here). Sweat is treated as carrying about 40 mmol of sodium per litre and the sports drink about 20 mmol per litre (about 460 mg). The kidneys can clear extra water only slowly during exercise. Body water starts at 60% of body weight, and 1 L of water is treated as 1 kg. Blood sodium is estimated from total body water and sodium. One simulated hour passes about every 5 seconds.
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A teaching model with rounded values, not a prediction for any person. Bone mass is shown as a percent of a typical peak. Growth is fastest in the teen years and peaks around 30. Calcium absorption is set at about 30% with enough vitamin D and about 15% when vitamin D is low. Loss after 35 is about 0.5% a year, faster with little activity or low calcium, and about 2% a year for several years after menopause (1.6% here). Genes, hormones, medicines and many other factors matter in real life.
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Fictional people and rounded teaching values. For learning only, not personal medical or diet advice; real care plans are made by the health care team.
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