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Yes, many clinics ask you to stop eating 2–4 hours before a contrast CT; water is usually fine unless your instructions say otherwise.

Yes, fasting before a colonoscopy is usually required: no solid food the day before, then stop all drinks a few hours before your check-in.

No, PSA tests don’t require fasting, unless your clinician orders PSA with other blood tests that do.

Men tend to score a bit faster on simple reaction-time tests, but the overlap is wide and task choice often changes the outcome.

Women usually don’t lose muscle faster than men; the pace can feel different because hormones and starting muscle levels differ.

Women tend to lose bone faster after menopause, yet bone loss speed varies a lot, and many men also reach low bone density.

Squats and leg presses can help you run faster by building leg force. Sprint work turns that strength into speed.

Super shoes can make you faster by lowering the energy cost of running, but the gain depends on pace, fit, and how steady you run in them.

Yes, strong calves can help you run faster by improving push-off and ankle stiffness, but speed still comes from the whole stride.

No, stiff ankles don’t automatically make you faster; speed comes from springy strength plus enough ankle range to hit good positions.