Sunday, December 9, 2012
Good to Know Info
Behaviors that lead to obesity influence chemical reactions in excess fat stored at the cellular and tissue levels. When an individual consumes too few or too many calories, also when a diet high in saturated fats is consumed, the body responds by adjusting appetite, fat storage and metabolism.
Fat cells called adipose cells produce and secrete the hormone leptin, which is a protein that travels through the circulatory system to all parts of the body. The body utilizes this hormone as a chemical signal to determine the amount of body fat present. Dietary and Endocrine factors regulate leptin expression.
Under normal circumstances, leptin is involved with inhibiting appetite, also with balancing energy uptake and expenditure. When the amount of leptin reaches a certain level, overweight or obese individuals find themselves developing a resistance to it, and their appetites are not suppressed efficiently. This results in an increase in energy (food) intake, thus adding "fuel to the fire," per say.
A diet high in saturated fats also induces leptin resistance.
The hormone leptin works to maintain body fat between the range of 15-20%. However, once fat levels reach an obese stage, the body ignores these chemical signals and resets itself to maintain an obese state rather than the normal range of 15-20%