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The “thrifty gene hypothesis” suggests we evolved genes for efficient food collection and fat deposition to survive periods of famine and that now that food is continuously available, these genes are disadvantageous because they make us obese in preparation for a famine that never comes. However, famines are relatively infrequent modern phenomena that involve insufficient mortality for thrifty genes to propagate. I suggest here that early hominids would have been subjected to stabilizing selection for body fatness, with obesity selected against by the risk of predation. Around two million years ago predation was removed as a significant factor by the development of social behavior, weapons, and fire. The absence of predation led to a change in the population distribution of body fatness due to random mutations and drift. Because this novel hypothesis involves random drift, rather than directed selection, it explains why, even in Western society, most people are not obese. Cited by (0)Copyright © 2007 Elsevier Inc. All rights reserved. Get help with accessInstitutional accessAccess to content on Oxford Academic is often provided through institutional subscriptions and purchases. If you are a member of an institution with an active account, you may be able to access content in one of the following ways: IP based accessTypically, access is provided across an institutional network to a range of IP addresses. This authentication occurs automatically, and it is not possible to sign out of an IP authenticated account. Sign in through your institutionChoose this option to get remote access when outside your institution. Shibboleth / Open Athens technology is used to provide single sign-on between your institution’s website and Oxford Academic.
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Signed in but can't access contentOxford Academic is home to a wide variety of products. The institutional subscription may not cover the content that you are trying to access. If you believe you should have access to that content, please contact your librarian. Institutional account managementFor librarians and administrators, your personal account also provides access to institutional account management. Here you will find options to view and activate subscriptions, manage institutional settings and access options, access usage statistics, and more. How many people in the world today do not have access to adequate nutrition the most basic element of good health?Today, 1 in 8 people in the world do not have access to adequate nutrition, the most basic element of good health.
Which areas of culture are off limits to anthropological study and critique?Which areas of culture should be off limits to anthropological study and critique? None, all aspects of life are appropriate to study. Subdivisions into specialties such as law, politics, medical anthropology and education.
What are some of the forms of evidence that indicate early ideas about religion?The earliest evidence of religious thought is based on the ritual treatment of the dead. Most animals display only a casual interest in the dead of their own species. Ritual burial thus represents a significant change in human behavior.
Which of the following statements best describes the relationship between agricultural food production and feeding the world's population?Which of the following statements best describes the relationship between agricultural food production and feeding the world's population? There is enough food produced to feed everyone on the planet, only it is unevenly distributed, and some regions face shortages and hunger.
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Why might humans be susceptible to obesity based on our ancient history as foraging peoples?
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