Healthy breakfast. Woman carrying a healthy breakfast. In her right hand she is holding a plate of yoghurt, a slice of melon (Cucumis melo) and shelled almonds (Prunus dulcis) and in her left, a plate of grapefruit (Citrus paradisi), limes (Citrus aurantifolia) and tangerines (whole and peeled, Citrus reticulata). The fruit is a good source of vitamin C, while the nuts are rich in E and B-complex vitamins. The nuts are also a good source of proteins and fatty acids. Yoghurt is made by fermentation of milk by bacteria and contains proteins and calcium.