NBCUniversal June 12, 2019 5:49 pm What is the Keto Diet? The Keto Diet has gained popularity for weight loss, but what is the Keto Diet and how can it affect you? US & World Videos 8:39 Gina Rodriguez gushes 0ver motherhood with son Charlie 2:22 Scarlett Johansson and Colin Jost have date night at White House Correspondents' dinner 2:09 President of MIT calls for shutting down pro-Palestinian encampments 3:57 Pleasant Sunday despite morning showers 1:00 Three dead in apparent murder-suicide in Lowell