Understanding Non-Alcoholic Fatty Liver Disease
Non-alcoholic fatty liver disease (NAFLD) is a condition where fat accumulates in the liver, making up more than 5% of its weight. This occurs in individuals who consume little or no alcohol and do not have other secondary causes such as viral infections, certain medications, or metabolic disorders. NAFLD is a growing global concern, affecting approximately 25–30% of the population. It is particularly prevalent among people with obesity, type 2 diabetes, and dyslipidemia.
In Vietnam, the prevalence of NAFLD is increasing rapidly due to rising obesity rates and sedentary lifestyles. The condition is closely linked to insulin resistance and disorders in lipid and glucose metabolism, which lead to the accumulation of triglycerides in the liver. Over time, this can cause oxidative damage, inflammation, mitochondrial dysfunction, hepatitis, and even liver fibrosis.
Since there is currently no specific medication for NAFLD, early intervention through lifestyle changes is essential for managing the condition and preventing its progression. These changes include dietary modifications, regular physical activity, maintaining a healthy weight, and ensuring adequate sleep.
Dietary Guidelines for Managing NAFLD
One of the key principles in managing NAFLD is limiting fat intake. Saturated and trans fats should be replaced with unsaturated fats, especially omega-3 fatty acids, which are beneficial for both heart and liver health. Saturated fat should make up less than 7–10% of daily energy intake. Adults should aim for about 45–60 grams of fat per day, or 20–25% of total daily energy.
Healthy sources of fat include:
- 20–25 grams of vegetable oils daily (around two tablespoons)
- 15–20 grams of nuts such as walnuts, almonds, and sesame seeds
- Fatty fish like salmon, mackerel, and sardines, which should be consumed two to three times a week to boost omega-3 intake
Carbohydrates should primarily come from low-glycemic index (GI) foods. These include leafy greens, whole grains, legumes, and certain fruits like pears, oranges, apples, guavas, and grapefruit. Recommended daily portions include:
- 300–350 grams of white or brown rice (equivalent to two to 2.5 bowls per meal for two meals)
- Two to three slices of whole-grain bread
- 100–150 grams of boiled sweet potato or potato
- Two to three servings of fresh fruit daily, with each serving weighing 80–100 grams
It is also important to reduce consumption of foods and drinks high in simple sugars, especially fructose found in soft drinks, sports drinks, sweetened tea, and fruit juices. Sugar should account for no more than 10% of daily energy intake, ideally under 5%—about 25 grams per day for adults.
Avoiding animal organs such as liver, intestines, heart, and brain, which are high in cholesterol, is also recommended. Additionally, it is best to steer clear of fast food and processed products that often contain excessive salt and unhealthy fats. Alcohol should be completely avoided, as it can cause severe liver damage and worsen NAFLD.
Lifestyle Changes to Support Liver Health
Beyond diet, lifestyle factors play a significant role in the progression of NAFLD. Staying up late disrupts the body’s biological rhythm, lowers sleep quality, and increases inflammation. Adults should aim for seven to eight hours of sleep per night.
Regular physical activity is another crucial component. Aim for at least 30 minutes of exercise daily, five days a week. Drinking 1.5–2 liters of water daily and limiting sugary and carbonated drinks can also help manage the condition.
Monitoring liver enzyme levels regularly and following medical advice are essential for tracking and managing NAFLD effectively. By making these lifestyle changes, individuals can significantly improve their liver health and reduce the risk of complications associated with NAFLD.