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It is a common observation in families, businesses, and social settings. Two persons may appear to eat similar meals, have similar lifestyles, and undergo very different changes in body weight over time. While food intake is still a significant element, contemporary research has revealed that weight gain is regulated by a variety of biological processes that go beyond what is apparent on the plate.
Overweight and obesity rates in India have been steadily rising across all age categories. According to the National Family Health Survey 6, approximately one-fourth of Indian individuals are overweight or obese. Excess weight increases the risk of type 2 diabetes, hypertension, heart disease, fatty liver disease, sleep disturbances, some malignancies, and joint problems. Understanding why weight gain occurs differently in different individuals is therefore important from both a preventive and clinical perspective.
The traditional concept of calories consumed versus calories burned remains scientifically valid. However, the way the human body processes, stores and expends energy can vary considerably from person to person.
Differences in everyday movement
Non-exercise activity thermogenesis, or NEAT, plays an important role in weight management. This includes standing, strolling around the house or office, changing posture, climbing stairs, fidgeting, and other spontaneous movements throughout the day.
According to research, some people naturally engage in more of these unconscious tasks, which results in increased energy consumption. Others may remain relatively inactive despite partaking in the same scheduled exercise routine, which increases the likelihood of storing excess calories as body fat.
The Role of Hormones
Body weight is closely regulated by a network of hormones that influence hunger, fullness and energy balance.
Key hormones include:
- Leptin, which signals satiety and helps regulate appetite
- Ghrelin, which stimulates hunger
- Insulin, which influences glucose metabolism and fat storage
- GLP 1, which affects appetite control and gastric emptying
The brain, specifically the hypothalamus, is constantly receiving and interpreting these messages. Variations in hormonal reactions can cause some people to feel hungry sooner, seek food more frequently, or have lower feelings of fullness after meals. Over time, even little changes in appetite management might lead to steady weight gain.
Resting metabolism matters
A significant proportion of daily calorie expenditure occurs while the body is at rest. This is known as the resting metabolic rate.
Several factors influence resting metabolism:
- Muscle mass
- Age
- Sex
- Thyroid function
- Organ size and composition
- Genetic factors
Individuals with greater lean muscle mass generally burn more calories throughout the day, even when not physically active. In contrast, a relatively lower metabolic rate may predispose certain individuals to gain weight more easily despite similar food intake.
The Influence of Genetics
Genetics can influence appetite control, food preferences, energy expenditure, and fat storage habits. Scientific research has revealed various genes that are associated with obesity risk.
Genetic tendency does not guaranty weight increase or make weight management impossible. However, it may have an impact on how efficiently the body stores energy and how strongly hunger signals are perceived.
This explains why two people on similar diets can have different long-term weight outcomes.
- Food quality is as important as quantity
- Meals that appear similar may not have identical metabolic effects.
The body uses energy to digest, absorb and process food, a phenomenon known as diet induced thermogenesis. Protein rich foods generally require more energy to metabolise than fats or refined carbohydrates.
Several dietary factors can influence weight regulation:
- Protein content
- Fibre intake
- Degree of food processing
- Meal timing
- Sugar sweetened beverages
- Hidden cooking fats and oils
As a result, two meals with comparable calorie counts may affect satiety, metabolism and fat storage differently.
The Emerging Role of Gut Health
Scientists are increasingly studying the gut microbiome, the trillions of microorganisms that reside within the digestive tract.
Evidence suggests that certain microbial patterns may influence:
- Energy extraction from food
- Appetite regulation
- Inflammation
- Fat storage
Although research in this field is still evolving, rising evidence suggests that gut health may play a role in determining how efficiently calories are used by the body.
Sleep and Weight Gain
Poor sleep has been shown as a significant contributor to obesity and metabolic diseases.
Inadequate sleep can affect hormones that regulate hunger, increase desires for calorie-dense foods, and limit energy expenditure throughout the day. Sleep deprivation has also been linked to insulin resistance and an increased likelihood of acquiring type 2 diabetes.
Adults who routinely get insufficient sleep struggle more to maintain a healthy weight than those who get enough restorative sleep.
Hidden contributors are sometimes neglected; many factors that promote weight growth may not be readily visible.
These include:
- Frequent snacking
- Weekend overeating
- Alcohol consumption
- Sugary beverages
- Certain medications
- Stress related eating
- Sedentary occupations
Even minor daily calorie surpluses, accumulated over months or years, can result in significant weight gain.
Weight growth is rarely caused by a single reason. It reflects a complex interplay of biology, behavior, metabolism, sleep, hormones, genetics, and lifestyle habits. Recognizing these variances might help shift the conversation about obesity away from simple assumptions and toward a more informed knowledge of how the human body manages weight.
(Disclaimer: This article contains the author’s personal opinions. Shree1news takes no responsibility for the accuracy, completeness, appropriateness, or validity of any information in this article. All information is supplied as-is. )
