Chicken liver and other organ meats are packed with so many essential vitamins and minerals that you could theoretically survive on just them, even if you're eating very few calories.

We analyzed the available evidence and found that chicken liver and other organ meats contain high levels of essential vitamins and minerals, to the point where it’s theoretically possible to meet basic nutritional needs on them alone, even during caloric restriction [1]. The evidence we’ve reviewed so far leans toward this being biologically plausible, as no studies or assertions contradict this claim. Chicken liver is especially rich in vitamin A, B12, iron, copper, and choline — nutrients critical for energy production, nerve function, and blood health. In very low-calorie settings, where every bite counts, these dense nutrients may help prevent deficiencies that often arise when food intake is sharply reduced. However, this does not mean chicken liver alone provides all nutrients in ideal amounts, or that long-term use would be comfortable or sustainable. We have not reviewed data on long-term effects, digestibility, or individual tolerance — only whether the nutrient profile could, in theory, support survival under caloric restriction. There is no evidence suggesting it fails to do so, but there is also no evidence showing how well someone would actually feel or function over weeks or months eating only chicken liver. What we’ve found so far suggests chicken liver could serve as a nutrient-dense foundation during short-term caloric restriction, but it doesn’t tell us whether it’s practical, enjoyable, or safe beyond basic survival. If you’re considering this approach, it’s worth remembering that food is more than nutrients — variety, texture, and psychological satisfaction matter too.