Fatty liver disease (NAFLD) is increasingly common across ages, affecting young adults and teens due to obesity, but traditionally peaks in middle-aged and older adults, especially after 50, with prevalence rising significantly past 60 and peaking around 60-70 years, particularly in women after menopause as hormone shifts increase belly fat. While once considered an older adult issue, its rise in younger populations highlights a growing epidemic linked to metabolic syndrome.
Fatty liver disease can affect individuals of all ages, but it is more common in people over the age of 50. Men are generally more prone to NAFLD due to higher rates of alcohol consumption, whereas women with NAFLD may experience more severe disease.
Metabolic dysfunction-associated steatotic liver disease (MASLD), formerly called nonalcoholic fatty liver disease (NAFLD), is a liver condition that affects people with excess weight, obesity or other metabolic conditions, such as type 2 diabetes, high blood pressure or high cholesterol.
But here's the twist almost no one saw coming: fatty liver disease is now showing up in younger adults, people in their 20s, 30s, even late teens. And not because they're drinking their weight in cocktails. In fact, most of the patients we meet are shocked when they hear the words “You may have fatty liver.”
Symptoms of non-alcoholic fatty liver disease
Eating excess calories causes fat to build up in the liver. When the liver does not process and break down fats as it normally should, too much fat will accumulate. People tend to develop fatty liver if they have certain other conditions, such as obesity, diabetes or high triglycerides.
Overview. Grade 1 fatty liver, known as mild hepatic steatosis, is the least severe non-alcoholic fatty liver disease (NAFLD) stage. It indicates the presence of minimal fat accumulation in liver cells. While often asymptomatic, it signifies the initial phase of the condition.
“Many people, and even some doctors, think fatty liver is just something you have to live with.” says Dr. Halegoua-DeMarzio, “But it's not. If ignored, it can lead to serious complications including cancer or liver transplant.”
Aerobic exercise (such as brisk walking, cycling, swimming, jogging, dancing and team sports) is particularly beneficial for the management of fatty liver and also improves the health of your heart, blood vessels and your aerobic fitness.
Excess weight, obesity, high blood pressure, high blood sugar, and diabetes can increase your risk of developing NAFLD. While genetics can also be a factor, NAFLD is tied to lifestyle factors, such as diet and lack of exercise, and has risen alongside the obesity epidemic in the U.S.
Although non-alcoholic fatty liver disease (NAFLD) is usually associated with obesity, patients who are not obese can also present with NAFLD. This subset of individuals, known to have 'lean NAFLD' or 'non-obese NAFLD', is growing increasingly prevalent. NAFLD in lean patients appears to be more common among Asians.
The goal is to lose 7 to 10% of body weight per year and exercise more than 200 minutes per week. The good news is that NAFL and NASH are reversible. However, once fatty liver has progressed to cirrhosis or liver cancer, it is no longer reversible.
Although lean individuals can develop NAFLD, several factors have been implicated in this issue. These include high fructose intake, protein malnutrition (such as Kwashiorkor), the use of steatogenic drugs (like amiodarone, tamoxifen, methotrexate, and prednisolone), and genetic predisposition.
Caused by the excess buildup of fat in the liver and closely linked to the rising incidence of obesity and type 2 diabetes, NAFLD affects an estimated 30 percent of American adults.
The earliest stage of alcohol-related liver damage occurs when fat accumulates in liver cells due to the liver's impaired ability to process fats while metabolizing alcohol. Timeline to Development: Alcoholic fatty liver can develop within just a few days to weeks of heavy drinking.
“The scary thing is that they're only in their 30s and 40s,” he says, noting that the chances of developing liver disease go up the longer a person has been drinking and is most common between the ages of 40 and 50. Other Yale Medicine doctors have diagnosed people with liver disease when they are still in their 20s.
To reduce liver fat, it's recommended that people with fatty liver disease do 150 to 240 minutes per week of at least moderate intensity aerobic exercise. But even as little as 135 minutes per week of moderate intensity exercise (e.g. a 45 minute walk on three days per week) has been shown to be beneficial.
Foods that are high in saturated fat, such as fatty meats, french fries, butter and whole milk. Red and processed meats, such as lunch meats, hot dogs and chicken nuggets. Alcohol. People with MASLD should not drink wine, beer or other types of alcohol.
Breakfast options
Many people with MASLD don't have liver-related complications, especially if they lessen their metabolic risk factors. Research shows that people with MASLD live, on average, about three years less than those without the condition. MASLD can raise the risk of heart disease and certain types of cancer.
The most common causes of fatty liver are: being overweight or obese especially around the abdomen (tummy) having type 2 diabetes or insulin resistance. having high blood fats — cholesterol or high triglycerides.
Lifestyle changes such as choosing healthy foods, exercise, and weight loss are the most effective treatment for NAFLD. For overweight individuals, losing 10% of body weight has been shown to reduce the amount of fat in the liver and to reduce inflammation.
Stage 1 fatty liver: This is the mildest stage, where fat makes up 5-10% of the liver's weight. There are usually no clear symptoms, and it's often detected through regular health check-ups. This is also the stage with the highest prevalence. Treatment at this stage may not require medication.
Drugs. Medications commonly implicated in causing fatty liver include corticosteroids, antidepressant and antipsychotic medications and, most commonly, tamoxifen.