The organic foods needed for the paleo diet can be difficult to obtain and very expensive. Many people argue that the fruits and vegetables we eat today are not the same fruits and vegetables that early humans would have eaten; broccoli is only 2,000 years old, bananas about 3,000 years old (Tufts University, 2015). Others argue that a diet consisting primarily of meat is unsustainable for the world's population. There are no long-term studies showing that the paleo diet has lasting health benefits; In fact, many argue that cavemen lived shorter lives and therefore did not have time to develop the diseases we experience in modern society (cancer, diabetes). As it turns out, cavemen weren't picky eaters and probably ate a variety of foods depending on the era they lived in (the paleo period spanned millions of years and ended about over 13,000 years ago), where they lived and what was available (varied depending on the region they lived in). , including inland or coastal). Cavemen probably experienced periods of feast and famine, which is not an acceptable diet for them.