imported to Peru. Cultivation of ancient plants During the colonial period, and continuing up until the time of the Second World War, Peruvian cuisine focused on Spanish models and virtually ignored anything that could be regarded as native or Peruvian. Traditional food plants, which the indigenous people continued to eat, were regarded as "peasant food" to be avoided. These colonial attitudes took a long time to fade. Since the 1970s, there has been an effort to bring these native food plants out of obscurity. Some plants cultivated by ancient societies of Peru have been rediscovered by modern Peruvians, and are carefully studied by scientists. Due to the characteristics of its land and climate and the nutritional quality of its products, some Peruvian plants may play a vital role in future nutrition. Examples include quinoa (an excellent source of essential amino acids) and kañiwa, which look and cook like cereals but are pseudocereals. Nutritionists are also studying root vegetables, such as maca, and cereals like kiwicha. Since 1985, NASA has used some of these foods—quinoa, kiwicha and maca—for astronaut meals. Andean ingredients like tubers and quinoa (kinwa in the indigenous language Quechua) have also been promoted by members of Peru's Ministry of Culture and received international endorsements from celebrities like Oprah Winfrey and NASA as a new type of superfood. While Peruvian state actors and celebrity chefs argue that these efforts have created economic opportunity for rural farmers and built international cultural awareness, the commercialization of Andean ingredients has decreased crop biodiversity on indigenous lands. Heightened global demand has caused prices to increase so that these ingredients are becoming less accessible to the native Peruvians. For many of Peru's inhabitants, these food stocks allow for adequate nutrition, even though living standards are poor. Abandoning many of these staples during the Spanish domination and republican eras lowered nutritional levels. Peruvian cuisine is often made spicy with ají pepper, a basic ingredient. Peruvian chili peppers are not spicy but serve to give taste and color to dishes. Rice often accompanies dishes in Peruvian cuisine, and the regional sources of foods and traditions give rise to countless varieties of preparation and dishes. Regional differences Peru is a country that holds not just a variety of ethnic mixes since times ranging from the Inca Empire, the Viceroyalty and the Republic, but also a climatic variety of 28 individual climates. The mixing of cultures and the