Brazilian scientists had participants spend five minutes inhaling one of three substances: Sweet orange essential oil, tea tree oil, or plain old water. Participants then underwent a stressful test while having their vital signs measured. Those who sniffed orange oil were less anxious throughout the test, and the beneficial effects even lingered once the exam was over. More from Prevention.com: Smells That Boost Your Health  “The scent of a fresh fruit can do amazing things,” says Barbara Thomley, lead coordinator for the Complementary and Integrative Medicine Program at the Mayo Clinic. “From what we’ve seen with our patients, even a quick smell can make a major difference.” And orange isn’t the only citrus scent that can be an aromatic asset for your health. Based on the Mayo Clinic’s experience using aromatherapy with patients, Thomley says that citrus aromas are often useful in curbing stress and anxiety, as well as helping with digestion and nausea. “With any citrus smell, lessened anxiety always seems to emerge as a benefit,” she says. But different people respond to different aromas, which is why Thomley suggests experimenting with various scents. “If you like the smell, and it has positive connotations for you, you’ll experience the most benefit,” she says. Curious about what citrus scents can do you for you? Try giving these aromas a sniff: Grapefruit: Anecdotal evidence suggests that grapefruit aromas can curb depression and enhance memory, says Thomley. Or try taking a whiff before meals to control your appetite. Research from Japan’s Osaka University shows that the scent of grapefruit actually boosts metabolism and reduces food cravings.  Lemon: Prepping for a major meeting? Enhance your performance and your attitude by rubbing lemon balm inside your wrist. The mild lemon scent “sends you to a positive place,” says Thomley. In fact, a study at the UK’s Northumbria University found that exposure to lemon balm can improve cognitive performance and mood. Mandarin: At the Mayo Clinic, massage therapists and acupuncturists augment therapies with the gentle scent of mandarin essential oil. Patients have reported reduced stress, better digestion and less nausea, says Thomley. More from Prevention.com: How Aromatherapy Works      Follow her on Twitter: @katiedrumm Send news tips and positive vibes to: Katie.Drummond@rodale.com