The average pea weighs between 0.1 and 0.36 grams. The earliest pea is thought to have dated back to 4800BC to 4400BC in the Nile Delta area. Early peas have also been discovered in upper Egypt around 3800BC to 3600BC - some of which were discovered in Egyptian tombs. This has led archaeologists to suggest the pea originally came from the near east in countries like Turkey, Jordan and Syria with the vegetable's popularity spreading from there. The pea is only green when eaten because it is picked when still immature. A ripe pea is more yellow in colour. Eating peas when they are green became fashionable in the 1600s and 1700s but was described by the French as "madness". Pea leaves are considered a delicacy in China. Peas are said to give relief to ulcer pains in the stomach because they help 'use up' stomach acids.