Some medically recommended substitutions for vegetable oil include fruit juices or sauces, mashed fruit, yogurt, fruit or vegetable purees, coconut or olive oil, butter, lard or fat. Substitute a quarter to a full cup of any type of fruit juice, sauce, mash or puree for one serving of vegetable oil. This quantity can vary depending on the use.
For baking, it may be necessary to use more. Fruit is a particularly good alternative for muffins because it adds to the flavor complexity of the overall dish while achieving the same results as the oil. When using fruit-based substitutions for vegetable oil in baking, it is important to adjust the amount of sugar added to the recipe; most fruits are naturally high in sugar.