The document defines obesity and overweight, stating that excess weight is when body weight exceeds a certain measure in relation to height, and obesity is the accumulation of excess fat that is incompatible with health. It notes that to maintain a healthy weight, a person must balance the energy consumed through diet with the energy expended daily, and that weight gain occurs when this balance is disrupted through consuming more or less calories than expended. One common method for assessing weight is the body mass index, which is calculated using an individual's weight in kilograms divided by their height in meters squared.

1. DefiningobesityandoverweightIn orderto understand the principle of weight loss, the concept of
obesity and overweight must first be known; Where excess weight is defined as the condition in
whichthe bodyweightexceeds a certain measure in relation to height, and obesity is defined: it is
the accumulation of fat in the body to a degree that is incompatible with health.
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To maintain a healthy weight, a person must balance the energy consumed in the diet with the
energy that the body consumes daily throughout life, and there are many reasons for obesity and
weightgain,butthe imbalance occursinthe body weight of a healthy person when this equation is
disrupted, when the amount of energy increases ( Calories) consumed in the diet than the energy
(calories) consumed, or when the energy consumed falls below that intake, a gradual increase in
weightoccursaccordingto the extentof the differencebetweenthem.One of the commonmethods
for assessingweightisthe use of bodymassindex,whichiscalculated from the following equation:
body weight in kilograms/height squared in metres.[1]