Education Corner

What Is Hypothyroidism? Hypothyroidism (often called “underactive thyroid”) means the thyroid gland in the front of the neck produces insufficient thyroid hormones. Thyroid hormones regulate how the body uses energy—they act like the body’s “accelerator pedal.” When levels are too low, metabolism slows down. The condition is more common in adult women, but it can affect people of any age or gender.   Why Does Hypothyroidism Lead to Weight Gain? Slower metabolism: The body burns calories more slowly. Even if you eat and exercise the same as before, fewer calories are used, leading to gradual weight gain. Fluid and salt retention: Low thyroid function makes the body more likely to retain water. Mild swelling may appear in the hands, feet, face, eyelids, or limbs. The extra weight isn’t just fat but also “water weight.” Fatigue and inactivity: Feeling tired, sleepy, or lazy reduces daily activity. Less movement means fewer calories burned, creating a vicious cycle of “the more tired you feel, the less active you are—and the more weight you gain.” Low body temperature and cold intolerance: Reduced thyroid hormones lower body temperature and heat production, decreasing fat-burning efficiency.   Besides Weight Gain, What Are Common Symptoms? Persistent fatigue, poor concentration, low mood. Feeling cold easily, cold hands and feet. Dry skin, hair loss, brittle nails. Constipation, poor appetite but weight still increasing. In women, heavier and irregular periods. Slow heartbeat, slow reaction, or hoarse voice.   How Is Hypothyroidism Diagnosed? Blood tests: Measure thyroid-stimulating hormone (TSH) and thyroxine (T4) levels. Antibody tests: To check for autoimmune causes such as Hashimoto’s thyroiditis. Thyroid ultrasound: To evaluate gland size and structure.   Can Weight Gain from Hypothyroidism Be Reversed? In most cases, yes—with proper treatment and management: Medication: Daily thyroid hormone replacement prescribed by a doctor. Lifestyle adjustments: Once hormone levels stabilize, gradually increase light to moderate exercise (e.g., brisk walking, jogging, swimming) and adopt a low-fat, low-sugar diet. Stress management: Maintaining good emotional health helps balance the endocrine system.   Weight Management Tips for People with Hypothyroidism Do not stop medication or change dosage on your own. Follow your doctor’s instructions and attend regular check-ups. Aim for slow, steady weight loss—about 1–2 kg per month. Avoid taking thyroid-related supplements without medical advice. Consult your doctor or dietitian first. Inform your doctor about any other medications you are taking to avoid drug interactions.   Who Should Pay Special Attention to Thyroid Function and Weight Changes? Middle-aged or older women. Individuals with autoimmune conditions or a family history of thyroid disease. Women who have recently given birth, as postpartum thyroid changes are common. People who feel constantly tired and cannot explain sudden weight gain.   Hypothyroidism can seriously affect weight and metabolism. If you notice unexplained weight gain or related symptoms, seek medical assessment early. Timely diagnosis and treatment can prevent long-term complications.

Why Is Obesity Linked to Cancer? Obesity doesn’t just affect the heart and joints—it also raises the risk of several types of cancer. Studies show that maintaining a healthy weight could help prevent up to 40% of cancers worldwide.   How Does Obesity Gradually Increase Cancer Risk? Harmful substances from fat: Abdominal and visceral fat produce excess estrogen, which can stimulate abnormal growth in breast and uterine cells. Chronic inflammation: Fat tissue releases inflammatory substances that cause long-term low-grade inflammation throughout the body, damaging DNA and increasing the likelihood of cell mutation. Excess growth factors: Obesity raises levels of certain hormones and growth factors that promote cell division, making it easier for cancer cells to spread. Insulin resistance: Higher insulin levels associated with obesity can overstimulate intestinal and pancreatic cells, increasing the risk of abnormal proliferation.   Which Cancers Are Most Closely Linked to Obesity? Women’s cancers: Breast cancer, endometrial (uterine) cancer, ovarian cancer. Digestive system cancers: Colorectal, stomach, pancreatic, and liver cancers. Other types: Esophageal, kidney, and gallbladder cancers.Research indicates that people with obesity have a 1 to 2 times higher risk of developing these cancers compared to individuals with normal body weight.   Early Warning Signs of Obesity-Related Cancer Persistent fatigue or unexplained weight changes. Digestive issues such as indigestion, abdominal pain, or altered bowel habits. Abnormal bleeding, chronic cough, or hoarseness. New lumps, warts, or non-healing ulcers on the skin or mucous membranes. Note: These symptoms do not always indicate cancer, but medical evaluation and screening should be done early.   How to Lower Cancer Risk Caused by Obesity Weight loss for cancer prevention: Losing even 5–10% of body weight can significantly reduce cancer-related biomarkers. Healthy diet: Eat at least five servings of fruits and vegetables daily for antioxidant protection. Choose whole grains and legumes instead of refined carbohydrates. Reduce intake of red meat, processed meats, and high-heat grilled foods. Regular exercise: Do at least 150 minutes of moderate activity per week (e.g., brisk walking) to reduce inflammation and hormonal imbalances. Quit smoking and limit alcohol: The combination of smoking and obesity multiplies cancer risk.   How to Prevent Obesity-Related Cancers Regular screenings: Women aged 40 and above: Mammogram screening. Individuals aged 50 and above: Colonoscopy. Those with a strong family history: Consider earlier or personalized screening. Weight monitoring: Check BMI and waist circumference yearly; aim for <90 cm in men and <80 cm in women. Healthy lifestyle: Ensure adequate sleep, manage stress, and avoid long-term high-sugar, high-fat diets.   Obesity can significantly raise the risk of developing cancer. If you notice unexplained symptoms or persistent changes in weight, consult a doctor promptly for detailed assessment and early intervention to prevent cancer-related complications.

The Hidden Dangers of Obesity and Sleep ApneaObstructive sleep apnea (OSA) is closely linked with obesity, yet many people are unaware of how serious this condition can be.   Why Does Obesity Increase the Risk of Sleep Apnea? Obese individuals—especially those with excess fat around the neck, chin, and abdomen—are more likely to experience airway compression during sleep. This narrowing or temporary “collapse” of the upper airway leads to breathing interruptions.When airflow becomes restricted, breathing repeatedly stops and starts throughout the night, a condition known as obstructive sleep apnea.Studies show that obese people are several times more likely to develop sleep apnea than those with a healthy weight, and the risk is particularly high in those with abdominal obesity or a noticeable belly.   How Does Sleep Apnea Affect the Body? Cardiovascular strain: Each pause in breathing forces the heart to work harder, increasing the risk of high blood pressure, heart disease, and stroke. Daytime fatigue and cognitive issues: Poor sleep quality causes drowsiness, irritability, and poor concentration, raising safety concerns—especially when driving. Metabolic impact: Lack of sleep disrupts hormones that regulate appetite, making people hungrier and creating a vicious cycle where weight gain worsens sleep apnea.   Common Warning Signs to Watch For Loud, irregular snoring with pauses in breathing lasting a few seconds to over ten seconds. Gasping or choking episodes during sleep, sometimes waking up abruptly and feeling breathless or tight-chested. Morning headaches, dry mouth, or sore throat, with a feeling of unrested sleep. Excessive daytime sleepiness, irritability, or poor focus, even after a seemingly full night’s sleep.   How to Manage Obesity and Sleep Apnea Weight management: Maintain a balanced diet—reduce oily, sugary foods and eat more fruits and vegetables. Engage in at least 150 minutes of moderate exercise per week, such as brisk walking or cycling. Better sleep habits: Avoid heavy meals and alcohol before bedtime. Try sleeping on your side instead of on your back. Medical treatments: Undergo a sleep study to assess the severity of the condition. For moderate to severe cases, using a CPAP (Continuous Positive Airway Pressure) machine can keep the airway open during sleep.   Obesity and sleep apnea can seriously harm heart health and reduce quality of life. If you experience loud snoring, pauses in breathing, or persistent daytime fatigue, seek medical evaluation early to identify the cause and prevent potential complications.

Why Does Obesity Increase the Risk of Osteoarthritis? Osteoarthritis is a degenerative joint disease involving the breakdown of cartilage. Obese individuals have up to a fourfold higher risk of developing it, especially in weight-bearing joints such as the knees and hips.   How Does Obesity Gradually Damage the Joints? Excessive mechanical stress: Every additional kilogram of body weight increases the load on the knees by four times, similar to constantly walking while carrying a heavy backpack. Cartilage wear and tear: Continuous pressure makes the joint cartilage thinner and harder, reducing its cushioning ability. Inflammation: Abdominal fat releases harmful substances that trigger inflammation and swelling in the tissues around the joints. Vicious cycle: Joint pain limits mobility, which worsens obesity. Obese individuals are twice as likely to require joint replacement surgery.   What Are the Symptoms of Obesity-Related Osteoarthritis? Early stage: Morning stiffness, mild pain, and reduced flexibility. Middle stage: Increased pain during weight-bearing activities, joint swelling, and creaking sounds when moving. Late stage: Persistent pain, difficulty walking, and higher risk of disability.   How to Effectively Manage Obesity-Related Osteoarthritis Weight loss is essential: Losing 10 kg can reduce knee pain by 50% and improve function by 30%. Exercise recommendations: Choose low-impact exercises such as swimming or water walking. Strengthen thigh muscles to reduce knee stress. Nutritional supplements: Glucosamine and vitamin D may support joint health. Physical therapy: Heat therapy and ultrasound can relieve pain. Surgical options: Joint replacement should be considered in severe cases.   How to Prevent Joint Damage Caused by Obesity Maintain a healthy weight: Keep BMI below 25; aim for a waist circumference under 90 cm for men and 80 cm for women. Joint protection habits: Wear shock-absorbing sports shoes. Avoid prolonged heavy lifting and frequent stair climbing. Ensure daily calcium intake of about 1000 mg. Regular screening: People over 50 should get annual knee and hip X-rays.   Obesity can seriously harm knee joint health. If you experience joint pain or other related symptoms, seek medical advice promptly for comprehensive examination and early management to prevent complications of joint degeneration.

What is obesity?Obesity is a chronic disease where excess body fat accumulates and harms health. It is assessed mainly by BMI (weight in kg ÷ height in m²) and waist circumference.   BMI Categories Normal: 18.5–22.9 kg/m² Overweight: 23–24.9 kg/m² Obesity Class I: 25–29.9 kg/m² Obesity Class II: ≥30 kg/m² Severe/Morbid: ≥35/40 kg/m² Waist Circumference (Abdominal Obesity) Men: ≥90 cm Women: ≥80 cm   How Obesity Gradually Damages the Cardiovascular System Artery hardening and narrowing: Excess "bad" cholesterol adheres to vessel walls, forming fatty plaques that reduce elasticity. Sustained high blood pressure: Increased weight forces the heart to pump harder, leading to chronic hypertension. Lipid imbalance: Abdominal fat affects the liver, decreasing "good" cholesterol and raising "bad" cholesterol. Inflammatory response: Fat tissue releases harmful substances, causing ongoing vascular inflammation and accelerated aging.   Effective Management of Obesity-Related Cardiovascular Issues Lifestyle Changes (Core Treatment):Losing 5–10% body weight reduces inflammation by 20% and improves vessel elasticity. Regular Exercise: Aerobic: Brisk walking 30–45 minutes daily. Resistance training: 2–3 sessions weekly. Diet Principles: Adopt a Mediterranean-style diet. Increase Omega-3 sources like salmon, flaxseeds, and walnuts. Limit salt to <6g daily. Reduce saturated and trans fats. Monitoring and Interventions:Regularly check blood pressure, lipids, and glucose. Severe cases may consider bariatric surgery like gastric sleeve or bypass.   Obesity severely impacts cardiovascular health. If weight rises steadily or symptoms appear, seek medical evaluation promptly for early control and complication prevention. ​

What is fatty liver disease?Fatty liver disease occurs when excess fat accumulates in the liver. It is especially common among people who are overweight or obese, as abdominal fat can directly affect liver health.   Why does obesity easily cause fatty liver? Abdominal fat directly affects the liver: Visceral fat around the abdomen releases a large amount of free fatty acids that flow directly to the liver, turning liver cells into “fat storage units.” Disrupted blood sugar and lipid levels: Obesity often comes with high blood sugar and high cholesterol, forcing the liver to process excess sugar and fat, leading to overload. Inflammatory response: Fat tissue releases harmful substances that trigger chronic inflammation in the liver, accelerating liver damage. Vicious cycle: Fatty liver impairs liver function, slows metabolism, and makes weight control even more difficult.   What are the early warning signs of fatty liver? Common symptoms: Dull pain in the upper right abdomen, fatigue, and poor appetite. Physical signs: Itchy skin, yellowish eyes (mild jaundice), or mild liver swelling. Blood test findings: Mild to moderate elevation in liver enzymes. Severe warning signs: Abdominal fluid buildup, jaundice, or confusion — symptoms of advanced cirrhosis.   What are the serious consequences of fatty liver? Non-alcoholic steatohepatitis (NASH): Inflammation leads to liver fibrosis and eventually cirrhosis. Liver cancer risk: Chronic inflammation increases the risk of liver cancer. Cardiovascular complications: Fatty liver often coexists with high blood pressure, high cholesterol, and heart disease. Hong Kong data: Up to 40% of overweight adults have fatty liver, and 10–20% of these cases may progress to serious disease.   How to effectively improve obesity-related fatty liver? Weight reduction: Losing 7–10% of body weight can lower liver fat by 30–50%. Diet adjustments: Eat a low-fat, low-sugar diet with plenty of vegetables, fruits, whole grains, lean meat, and fish. Include daily sources of Omega-3 (such as salmon and flaxseeds) to protect the liver. Avoid alcohol and sugary drinks like juice or soda. Exercise habits: Do at least 150 minutes of moderate-intensity aerobic exercise weekly (e.g., brisk walking, swimming). Add muscle-strengthening exercises 2–3 times per week to boost fat burning. Medical monitoring: Have regular liver ultrasounds. In serious cases, medication may be needed to protect liver cells.   How to prevent obesity-related fatty liver? Waistline targets: Less than 90 cm for men and 80 cm for women to avoid visceral fat buildup. Annual check-up: Overweight adults over 30 should have yearly liver enzyme tests and liver ultrasounds. Healthy lifestyle: Walk at least 30 minutes daily; sit less and move more. Maintain a balanced diet and adequate sleep. Manage stress, as high cortisol levels can harm the liver.   Obesity can seriously damage liver health, leading to fatty liver and even cirrhosis. If you feel discomfort in the right abdomen or persistent fatigue, seek medical advice early for proper evaluation. Losing weight in time is key to preventing severe liver complications.