Have a food or nutrition question? Our experts are here to help. Browse below for previously asked and answered questions or contact us to submit your own question. Q: What is an RD or RDN? A: Registered dietitian nutritionists (also known as RDs or RDNs) — are the food and nutrition experts who can translate the science of nutrition into practical solutions for healthy living. RDNs use their nutrition expertise to help individuals make unique, positive lifestyle changes. We have over 1,600 RDs on our team! To learn more visit eatright.org. Q: Can I double a recipe? A: Yes, most recipes can be successfully doubled. Just check your math. - Chef Polly Sang Q: What does blanching mean? A: Blanching vegetables means cooking in boiling water until just crisp and green and then immediately soaking them in ice water to stop cooking.- Chef Polly Sang Q: Can dried herbs be substituted for fresh? A: Yes, dried herbs can be substituted for fresh. Substitute ¼ cup fresh herbs with 1 tsp dried. The flavor will change and you will want to add the dried herbs earlier in the cooking process where fresh herbs are usually added at the end.- Chef Polly Sang Q: Is it okay to drink coffee? A: Adults should feel free to enjoy that morning (and afternoon) cup of coffee. Unless you have a specific medical reason to limit coffee or caffeine in general, it seems the potential benefits currently outweigh the risks. To get the most from your coffee, limit the add ins like sugars and syrups that can make the extra calories add up quickly. If you're not a coffee drinker, you probably don't need to start for health reasons, but if you do, take it slowly. Caffeine can make you feel a little jittery if you aren't used to it. Read more here. Q: Are energy drinks safe? A: The key to staying energized is to eat well, stay active and get enough sleep. Moderate intake of energy drinks in healthy adults is likely safe, but probably not the best way to achieve long term energy. Read more here. Q: How do I choose a good health app? A: Look for trusted developers and providers. You want an app that will offer you accurate, helpful content and not compromise your personal information or the security of your mobile device. Ask your healthcare provider. They may have suggestions for apps they have tried. Read the reviews. If an app has consistently negative feedback, it probably isn’t a good choice. For a list of apps reviewed by Registered Dietitians visit http://www.eatright.org/appreviews.