You may already know that essential oils can help with everything from headaches and congestion, to upset stomachs. But did you know that they could also be a secret weight loss weapon? Some essential oils can have a pretty major impact on your mood, which in turn, could help nix the urge to nosh mindlessly. And others could affect things like blood sugar and fat-burning—two things that have a direct impact on weight. So, which ones work? Here’s a look at five research-backed picks, plus how to give them a try to reap the best results. Incorporate them into your routine, and you just might see slim down progress a little bit sooner.