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Weight gain is an increase in body weight. This can be either an increase in muscle mass, fat deposits, or excess fluids such as water. Weight gain without increased calorie rich food intake might be a symptom of a serious medical condition. Sometimes due to imbalance of thyroid hormones cause weight gain or weight loss. == Description == If enough weight is gained by way of increased body fat deposits, one may become overweight or fat, generally defined as having more body fat (adipose tissue) than is optimally healthy. Weight gain has a latency period. The effect that eating has on weight gain can vary greatly depending on the following factors: energy (calorie) density of foods, exercise regimen, amount of water intake, amount of salt contained in the food, time of day eaten, age of individual, individual's country of origin, individual's overall stress level, and amount of water retention in ankles/feet. Typical latency periods vary from three days to two weeks after ingestion. Having excess fat is a common condition, especially where food supplies are plentiful and lifestyles are sedentary. As much as 64% of the United States adult population is considered either overweight or obese, and this percentage has increased over the last four decades.〔.〕 Gaining weight can cause the following effects, dependent on the variable listed above, but are generally limited to: * Increase in body fat percentage * Increase in muscle mass * Increase in body hydration levels * Increase in breast size In more extreme cases: * A noticeably larger stomach * The abdomen will bulge outward and upward, creating a distended midsection 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「weight gain」の詳細全文を読む スポンサード リンク
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