Registered Nurse Comprehensive Predictor Practice Test

Increased vitamin C needs come from situations that raise oxidative stress or demand more collagen and immune activity. Stress, illness, and cigarette smoking all push the body to use and lose vitamin C more quickly. Smoking introduces a lot of free radicals, so the antioxidant vitamin C is used up to neutralize them, leading to lower levels unless intake is increased. Illness and inflammation boost the immune response and tissue repair processes, which require vitamin C for producing collagen and supporting white blood cell function; this elevates daily needs. Physical or emotional stress also raises metabolic activity and may increase antioxidant use, including vitamin C. Regular exercise with adequate sleep is not inherently a driver of higher vitamin C requirements in the same way, and tends to enhance overall antioxidant defenses. A high calcium intake or a low-fat diet doesn’t directly increase vitamin C needs.