To summarize, food intake is influenced by metabolic activity in hypothalamic neurons and elsewhere; by hormones that signal the body's fat content to the brain; and by other homeostatic-need situations such as low blood glucose. All of these represent instances of negative feedback.
<u>Answer:</u>
The factor that contributes to aging is: A Cells stop dividing after 50 divisions.
<u>Explanation:</u>
- Normally after 40 to 50 divisions the cells stops dividing because they had already lost too much DNA for other divisions.
- So they eventually die, making the appearance like an aged person in any individual.
- As DNA is copied in every cell division process, they tend to loose small part of telomeres in each transfer process.
- Hence, after 50 divisions these cells fails to divide resulting in aging.
An effect associated with over nutrition is obesity(becoming overweight).
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