Mayo Clinic specialists answer health questions from readers like you.

• Dark circles under your eyes: What causes them?
• Daytime sleepiness in older adults: Do naps help or hurt?
• Deep-fried turkey: How to prepare it safely
• 'Degenerative changes' in the spine: Is this arthritis?
• Delayed menstruation in teen: When should first period occur?
• Delayed muscle soreness: What causes it?
• Demyelinating disease: What causes it?
• Dental braces: When to start
• Dental fillings: Should metal fillings be replaced with composite?
• Dental floss vs. water pick: Which is better?
• Denture care: How do I clean dentures?
• Depression and anxiety: Can I have both?
• Depression treatment for children: What works?
• Detox diets: Do they work?
• Detox foot pads: Do they really work?
• Developmental hip dysplasia in infants
• Diabetes and Alzheimer's: Any connection?
• Diabetes and depression: Coping with the two conditions
• Diabetes diet: Should I avoid sweet fruits?
• Diabetes foods: Is honey a good substitute for sugar?
• Diabetes management: Does aspirin therapy prevent heart problems?
• Diabetes treatment: Can cinnamon lower blood sugar?
• Diabetes: Are electric blankets off-limits?
• Diabetes: Does alcohol and tobacco use increase my risk?
• Diabetes: How do I help protect my liver?
• Diastasis recti: How does pregnancy affect stomach muscles?
• Diet soda: Is it bad for you?
• Dietary supplement labels: What are 'international units'?
• Dieting? Beware of liquid calories
• Dietitian vs. nutritionist: What's the difference?
• Digestion: How long does it take?
• Dilation and curettage (D and C)
• Discolored baby teeth: A cause for concern?
• Discolored semen: What does it mean?
• Disk replacement: An effective treatment for low back pain?
• Diuretics: A cause of low potassium?
• Diverticulitis diet: Can certain foods trigger an attack?
• Diverticulitis diet: Should I avoid nuts and seeds?
• Do infrared saunas have any health benefits?
• Do the benefits of vitamin C include improved mood?
• Do toning shoes really work?
• Do weight-loss products such as Sensa work?
• Does sunscreen expire?
• Dog flu: Can humans catch it?
• Doppler ultrasound: What is it used for?
• Doula: What's a doula's role during childbirth?
• Down syndrome: Earlier prenatal testing is recommended
• Dried fruits: As good for you as fresh fruit?
• Drug interactions: What you should know about antacids
• Drug-induced comas: When and how are they used?
• Drug-resistant tuberculosis (XDR-TB): Am I at risk?
• Dry mouth treatment: Tips for controlling dry mouth
• Dysplasia: Is it cancer?
• Dystonia treatment: Can it impair bone growth?