Vegetable was very dull, typically comprising mainly some staple product made from rice, rye, barley, wheat, millet or maize. The addition of vegetable matter provided some variety to the diet. The staple diet of the Aztecs in Central America was maize and they cultivated tomatoes, avocados, beans, peppers, pumpkins, squashes, peanuts, and amaranth seeds to supplement their tortillas and porridge. In Peru, the Incas subsisted on maize in the lowlands and potatoes at higher altitudes. They also used seeds from quinoa, supplementing their diet with peppers, tomatoes, and avocados. In Ancient China, rice was the staple crop in the south and
Vegetable oils as alternative energy amount of energy as vegetable oil is low compared to many of the potential replacements for fossil fuels. The list of vegetable oils article discusses which types of vegetable oil are used for fuel and where different types are grown. Vegetable oil is used for transportation in four different ways: The transition can start with biodiesel, vegetable oil refining, and vegetable oil blends, since these technologies do not require the capital outlay of converting an engine to run on vegetable oils. Because it costs to convert vegetable oil into biodiesel it is expected that vegetable oil will always be cheaper