Is Obesity Genetic or Lifestyle-Related? The Truth Is Both
Obesity usually develops through an interaction between genetics, appetite biology, lifestyle and the surrounding environment, rather than one cause alone. Take the OVA Malaysia Quiz to explore whether a personalised, doctor-led weight-management programme may be suitable for you.
Genes can influence how hungry you feel, how easily you become full and how your body regulates weight. Lifestyle still matters, but two people following similar routines may not experience the same appetite or weight response.
Key Takeaways
Obesity is influenced by both inherited biology and lifestyle.
Genetics can affect appetite, fullness and body-weight regulation.
Genes increase susceptibility but do not guarantee a particular outcome.
Food access, sleep, stress, work routines and physical activity also matter.
Malaysian food culture is not the problem by itself; portions, frequency and preparation are more important.
Obesity should not be reduced to a lack of discipline.
Effective treatment may combine nutrition, activity, behavioural support and medication.
How Genetics Can Influence Weight
Most people with obesity do not have one single “obesity gene.” Instead, many genetic differences may combine to influence appetite, food preferences, energy use and fat storage.
Research has linked numerous genetic regions with body mass index and obesity risk. Many of these signals involve pathways in the brain that help regulate hunger and eating behaviour (Nature Reviews Genetics, 2022).
Genetics may influence:
How strongly you experience hunger
How quickly you feel full
Food cravings
Preference for energy-dense foods
How the body responds to weight loss
The tendency to regain weight
Where body fat is stored
This helps explain why maintaining a lower weight may feel considerably harder for one person than another.
Does Family History Mean Obesity Is Inevitable?
No. Having parents or close relatives with obesity may increase your susceptibility, but it does not determine your future with certainty.
Family members also share more than genes. They may share meals, sleep patterns, attitudes towards food, activity habits and the same neighbourhood environment.
A genetic tendency may become more noticeable in an environment where high-calorie foods are convenient, daily movement is limited and sleep is regularly disrupted. This is known as a gene-environment interaction.
A large 2024 study found that genetic risk and an obesity-promoting lifestyle can jointly raise obesity risk. It also found that healthier lifestyle patterns remained beneficial even among people with greater inherited susceptibility (Cell Metabolism, 2024).
Why Lifestyle Still Matters
Genetics can influence the difficulty level, but everyday routines still affect health and weight over time.
Relevant factors may include:
Meal portions
Sweetened drinks
Protein and fibre intake
Physical activity
Sedentary time
Sleep duration
Stress
Alcohol intake
Certain medicines
Work schedules
Lifestyle is not simply a matter of “choosing better.” Choices are shaped by cost, convenience, time, family responsibilities and food availability.
Someone working long shifts may rely on takeaway meals because cooking is unrealistic. Someone sleeping poorly may experience stronger hunger and have less energy for activity.
These circumstances should be addressed practically rather than treated as personal failures.
The Malaysian Environment Matters Too
Malaysia offers an enormous variety of affordable and convenient food. That is culturally valuable, but some common routines can make weight management more difficult.
Examples include:
Sweetened kopi or teh several times a day
Large rice or noodle portions
Frequent fried food
Rich gravies and sauces
Late-night mamak meals
Office kuih and snacks
Long hours of sitting
Driving for most journeys
You do not need to abandon Malaysian food to manage weight. More realistic changes include ordering less-sweet drinks, choosing one protein and two vegetable dishes at mixed-rice stalls, and taking a moderate portion of rice.
The goal is to adjust frequency, portions and preparation, not remove your culture from your diet.
Why “Eat Less and Move More” Is Incomplete
Weight changes involve energy intake and expenditure, but that description does not explain the biological forces that affect both.
When people lose weight, hunger may increase and the body may use less energy than before. This can make continued weight loss and maintenance harder.
Telling someone to eat less without addressing appetite, sleep, stress or medical factors may therefore be ineffective. It may also increase shame when the person struggles to maintain the changes.
A better approach asks:
What is driving hunger?
Is the meal pattern satisfying?
Is sleep affecting appetite?
Are medicines contributing to weight gain?
Is there a medical condition to investigate?
Is the plan sustainable within the person’s life?
Would structured treatment help?
Is Obesity a Willpower Problem?
No. Willpower is not a medical explanation for obesity.
People can influence their habits, but they do not choose their genetic susceptibility, appetite signals, childhood environment, work schedule or response to weight loss.
This does not mean personal actions are irrelevant. It means support should be designed around the person’s biology and circumstances rather than relying entirely on motivation.
Reducing blame can also make treatment more effective. Patients are more likely to discuss overeating, emotional triggers or missed medication honestly when they do not expect judgement.
When Lifestyle Changes May Be Enough
Some people can achieve meaningful improvements through changes to food, movement, sleep and stress management.
Helpful foundations may include:
Building meals around protein and vegetables
Reducing sweetened drinks
Increasing daily walking
Adding resistance exercise
Planning convenient meals
Improving sleep consistency
Monitoring portions without extreme restriction
Success should not be measured only by reaching a specific body size. Better blood pressure, improved glucose levels, greater fitness and a smaller waist can all be meaningful outcomes.
When Medical Treatment May Help
Medical support may be appropriate when lifestyle changes alone have not produced sufficient improvement, or when obesity is affecting health and quality of life.
A doctor may review:
Weight history
Family history
Current health conditions
Previous treatment attempts
Appetite and eating patterns
Current medicines
Sleep and stress
Potential treatment risks
Realistic goals
For eligible patients, treatment may include behavioural support, nutrition guidance or medication such as Mounjaro.
In SURMOUNT-1, Mounjaro produced substantial average weight reductions when combined with lifestyle intervention and structured clinical monitoring. The study supports treating obesity through both biological and behavioural pathways rather than expecting lifestyle advice to do all the work alone (The New England Journal of Medicine, 2022).
Through OVA Malaysia, eligible patients can access doctor-led telehealth assessment, treatment planning and ongoing monitoring.
What a Balanced Treatment Plan Looks Like
Because obesity has multiple causes, treatment should not depend on one strategy.
A practical plan may include:
Realistic nutrition changes
More daily movement
Strength-focused exercise
Sleep support
Behavioural strategies
Medical assessment
Prescription treatment where appropriate
Regular progress reviews
Genetics may explain why weight management is harder, but it does not remove the possibility of improvement. Lifestyle changes may help, but they should not be used to dismiss the need for medical care.
The most useful question is not whether obesity is genetic or lifestyle-related. It is which biological, behavioural and environmental factors are affecting this individual, and what support addresses them best?
FAQ
How much of obesity is genetic?
There is no single percentage that applies to every person. Genetic influence varies across populations, ages and environments.
Most obesity is considered polygenic, meaning many genetic differences contribute small effects.
Can obesity run in families?
Yes. Family patterns can reflect both shared genes and shared environments.
Relatives may have similar appetite biology, food routines, activity levels and health conditions.
Can healthy habits overcome genetic risk?
Healthy habits can improve health and reduce risk even when someone has a strong genetic susceptibility.
However, some people may need more intensive support than others to achieve similar weight outcomes.
Is obesity caused by eating too much?
Eating more energy than the body uses contributes to weight gain, but it does not explain why appetite, food intake and energy use differ between people.
Genetics, sleep, stress, medication, environment and health conditions can all affect those behaviours.
Can medication help with genetically influenced obesity?
Medication may help address biological pathways involved in appetite and weight regulation, but suitability depends on a medical assessment.
It is normally combined with nutrition, activity and ongoing monitoring rather than used as a standalone solution.