Home & Garden Home How to Keep Cut Avocados Fresh for a Week (Video) By Jerry James Stone Writer California Polytechnic State University Jerry James Stone is a food blogger, vegetarian chef, activist, and internet personality who started writing for Treehugger in 2004. our editorial process Twitter Twitter Jerry James Stone Updated October 11, 2018 ©. jerry James Stone Share Twitter Pinterest Email Home Sustainable Eating Pest Control Natural Cleaning DIY Family Green Living Thrift & Minimalism © jerry James Stone We all love avocados, right? Right! So there is nothing worse than losing half of this tasty, yet expensive, fruit to a few days in the refrigerator. See, the Omega-3 fatty acids found in the avocado are extremely sensitive to light, air and heat and the moment you cut one open, it begins to brown. Actually, I think it begins to brown the moment you pick up the knife, if not sooner. But using the easy steps outlined in this video, you can make that leftover avocado half last for days, almost a week!