Why does food, clothing, and dwellings change at different times in different historical periods?

Because the culture and technological progress have changed. For example, the main food in primitive times was the meat of wild animals or the fruits of nature, and clothes were sewn from the skins of killed animals. Later, people learned to grow food and raise livestock. This is how agriculture and cattle breeding, as well as weaving and leatherworking, arose. Clothes have become more comfortable and presentable.