Think of it this way - for the calorie price of a tablespoon of olive oil (all fat, nothing nutritious), you can have a huge, ~10 oz salad filled with veggies, fruit, whole grains and legumes. Have a look at PubMed for &quot;low-fat vegan&quot; clinical trials - people are put on plant-based diets with no calorie restriction and end up losing weight. Also, this recent video does a great job explaining energy density in foods: <a href="http:&#x2F;&#x2F;nutritionfacts.org&#x2F;video&#x2F;eating-more-to-weigh-less&#x2F;" rel="nofollow">http:&#x2F;&#x2F;nutritionfacts.org&#x2F;video&#x2F;eating-more-to-weigh-less&#x2F;</a>