One fruit that may help with fat-loss are avocados. Most people who follow a restricted carbohydrate diet fail to increase their fat content high enough to keep their bodies and metabolisms operating optimally. Per fruit, avocados have about 20 grams of healthy fats which over the course of a day is relatively low. Higher fat may not only increase metabolism but also increase testosterone levels which is one of the main hormones responsible in fat loss for both men AND women.