Guide

Yes—carbs after training can speed recovery by refilling muscle glycogen, especially after hard or long sessions.

Yes, hard workouts can trigger loose stools by speeding gut movement, shifting blood flow away from digestion, and stacking diet or hydration mistakes.

Most 1-hour screening drinks don’t need fasting, but the 2- or 3-hour tolerance test usually starts after an overnight fast.

Most MRI scans don’t require fasting, but exams with sedation or certain belly studies may ask for 4–8 hours without food.

Most people can eat as usual before the 1-hour screening drink; the longer tolerance tests often require an overnight fast.

No, fasting isn’t usually needed for a PSA blood draw unless your lab orders other tests that require it.

Most people don’t need to fast for a PSA blood draw unless your clinician also ordered fasting labs like glucose or a lipid panel.

Most thyroid blood tests don’t need fasting, but an empty stomach may be required when other labs are drawn at the same time.

Most thyroid blood tests don’t require fasting, yet add-on labs, biotin, and timing can change what “ready” means.

Many belly ultrasounds call for no food for 6–12 hours, with small sips of water often allowed unless your imaging center says otherwise.