The claim that carrots are more nutritious when cooked makes the truth seem more nuanced than it sounds. WebMD says cooking carrots helps your body absorb more beta-carotene, which is correct, but it is a secondary source. When I looked back at the original research, it comes from peer-reviewed nutrition studies that show how heat breaks down the carrot wall cells and boosts the absorption of carotenoids. Despite this being true, cooking also reduces heat-sensitive nutrients like vitamin C. So cooking them does not necessarily make them more nutritious; it changes how much more of a type of vitamin you are receiving.