Weight gain is a boost in body weight. This can include an increase in muscle mass, fat deposits, excess fluids such as water or other aspects. Weight gain can be a symptom of a major medical condition.

If enough weight is gotten due to increased body fat deposits, one might become obese or obese, normally defined as having more body fat (fat) than is considered great for health. The Body Mass Index (BMI) determines body weight in proportion to the square of height and defines ideal, inadequate, and excessive weight based on the ratio.


Weight gain has a latency period. The impact that consuming has on weight gain can vary considerably depending on the list below elements: energy (calorie) density of foods, exercise regimen, quantity of water intake, quantity of salt contained in the food, time of day consumed, age of person, person’s country of origin, individual’s overall tension level, and quantity of water retention in ankles/feet. Normal latency durations vary from 3 days to two weeks after ingestion.

Having excess fat (fat) is a common condition, especially where food supplies abound and way of life is sedentary. As much as 64% of the United States adult population is thought about either obese or obese, and this portion has increased over the last 4 decades.

A typically asserted “rule” for weight gain or loss is based on the assumption that a person pound of human fat tissue contains about 3,500 kilocalories (typically just called calories in the field of nutrition). Therefore, consuming 500 fewer calories than one requires each day should lead to a loss of about a pound per week. Similarly, for every 3500 calories consumed above the quantity one needs, a pound will be gained.

The presumption that a pound of human fat tissue represents about 3500 calories in the context of weight loss or gain is based upon an evaluation of previous observations and experiments by Max Wishnofsky released in 1958. He noted that a previous research study suggested that a pound of human fat is 87% fat, which equates to 395 grams of fat. He further presumed that animal fat consists of 9.5 calories per gram. Thus one pound of human fat tissue ought to include 3750 calories. He then critically examined the pertinent literature and used numerous extra presumptions, consisting of that the diet includes enough protein and that the individual is in glycogen and nitrogen (protein) balance, leading to most weight-loss stemming from the catabolism of fat. He concluded that a 3500 calorie excess or deficit for a person satisfying his assumptions, would lead to the gain or loss, respectively, of one pound of body weight. He kept in mind that if the presumptions he made are not satisfied, a deficit of 3500 calories would not always relate to a pound of weight loss.


Wishnofsky did not consider many aspects of human physiology and biochemistry which were unknown at the time. The claim has accomplished the status of a general rule and is repeated in various sources, used for diet planning by dietitians and misapplied at the population level as well.

Regarding fat increases, an individual usually puts on weight by increasing food intake, ending up being physically non-active, or both. When energy consumption exceeds energy expenditure (when the body remains in positive energy balance), the body can keep the excess energy as fat. Nevertheless, the physiology of weight gain and loss is complicated involving numerous hormones, body systems, and environmental factors. Other factors besides energy balance that might contribute to putting on weight consist of:

Social aspects
A study, including more than 12,000 individuals tracked over 32 years, discovered that social networks play a remarkably powerful function in figuring out an individual’s possibilities of gaining weight, sending an increased threat of ending up being obese from partners to husbands, from brothers to siblings and from pals to buddies.

The human microbiota facilitates fermentation of indigestible carbohydrates to short-chain fats, SCFAs, contributing to weight gain.  A change in the percentage of Bacteroidetes and Firmicutes might determine the host’s threat of obesity.

Sleep and stress
The absence of adequate sleep has been suggested as a cause for weight gain or the problem of keeping a healthy weight. Two hormonal agents responsible for regulating hunger and metabolism are leptin, which hinders cravings and increases energy expenditure, and ghrelin, which increases appetite and reduces energy expenditure. Research studies have shown that persistent sleep deprivation is connected with decreased levels of leptin and raised levels of ghrelin, which together lead to increased cravings, particularly for high fat and high carbohydrate foods. As a result, sleep deprivation with time might contribute to increased calorie consumption and reduced self-control over food yearnings, causing weight gain.

Hormone and neurotransmitter imbalances
Weight gain is a typical side-effect of specific psychiatric medications.

Pathological causes of weight gain include Cushing’s syndrome, hypothyroidism, insulinoma, and craniopharyngioma. Genetic factors can associate with Prader– Willi syndrome, Bardet– Biedl syndrome, Alström syndrome, Cohen syndrome, and Carpenter syndrome.

Excess adipose tissue can lead to medical issues; however, the around or big figure does not necessarily indicate a medical issue and is often not primarily caused by fat. If too much weight is gained, severe health side-effects may follow. A lot of medical conditions have been related to obesity. Health repercussions are classified as being the outcome of either increased fat mass (osteoarthritis, obstructive sleep apnea, social preconception) or an increased variety of fat cells (diabetes, some kinds of cancer, cardiovascular disease, non-alcoholic fatty liver disease). There are changes in the body’s response to insulin (insulin resistance), a pro-inflammatory state and an increased propensity to thrombosis (prothrombotic state).

The social point of view
In centuries past, a degree of plumpness has been viewed as indicative of personal or household success: “Calories were scarce, physical labor was hard, and the majority of people were as lean as greyhounds.”Only in the early 20th Century did fatness lose this appeal. The connection of fatness with financial well-being persists today in some less-developed nations. Indeed, it may be on the increase.

Despite the undertones that excess weight had in the past, it has for a long time been seen as “undesirable” in modern Western society. An extensive market has settled considering that the mid-20th century, focusing on weight loss routines, items, and surgeries. This market has been aided by the rising number of overweight and overweight citizens in the United States. Data from the CDC’s National Health and Nutrition Examination Survey suggests that the typical weight of ladies between ages 30 and 60 has increased by 20 pounds, or 14% because of 1976. Amongst women who weigh 300 pounds or more, the increase was 18%.

Nevertheless, some research study has shown the opposite pattern. It has been suggested that obesity amongst females residing in the U.S. has ended up being more socially appropriate. [18] According to a research study published in the July concern of Economic Inquiry, this is most likely because more than one-third of females aged 20 and older are overweight in the United States. The study found that the average woman weighed 147 pounds in 1994, however, mentioned that she wanted to weigh 132 pounds. By 2002, the typical lady weighed 153 pounds but stated that she wished to weigh 135 pounds. “The reality that even the wanted weight of females has increased recommends there is less public opinion to reduce weight,” the scientists kept in mind. However, the difference between women’s typical weight and preferred weight had increased too.

In any case, weight gain and weight reduction are still charged subjects. The ever-present social stigma concerning weight gain can have lasting and hazardous impacts on individuals, especially amongst young women. These are believed to consist of eating conditions and body dysmorphia.