# Nutrition in alpha-1 antitrypsin deficiency
Liver and digestive function
In alpha-1 antitrypsin deficiency (AAT deficiency), problems with the liver and digestion can affect how your body absorbs and processes nutrients. The liver plays a role in making proteins, storing certain vitamins, and breaking down nutrients.
When the liver is damaged by AAT buildup, it can mean that your body has difficulty absorbing certain vitamins (especially the fat-soluble vitamins A, D, E, and K). This can manifest in, for example, blistering, weak bones later in life, or slow blood clotting.
ProveniIncluded in official guidelines, or approved by EMA or FDA
In advanced liver disease, vitamins that are fat-bound are more difficult to absorb.
Protein also plays a special role: your body needs enough protein to recover, but the damaged liver can have difficulty with certain proteins. This can lead to fluid retention in the body or intestinal fluids. In severe liver disease, balancing protein intake is something that must be determined together with your healthcare provider.
Digestive problems
Some patients with AAT deficiency experience digestive-related complaints: diarrhea, abdominal pain, or irregular bowel movements. This can be related to inflammation in the intestines or how the body processes fats. When intestinal function is disrupted, nutrients can be absorbed less well, even if you eat enough.
ResearchediPositive results in clinical studies, not yet standard treatment
The connection between AAT deficiency and chronic intestinal inflammation (such as ulcerative colitis) is being studied; this can affect which foods are better tolerated.
If you have digestive complaints, it can help to eat regularly and in smaller portions, rather than three heavy meals. High-fat foods can be difficult for someone with poor fat absorption. A dietitian can help figure out which foods work better for your situation.
Weight and nutritional status
Maintaining your weight is important in AAT deficiency, especially if your liver is under stress. Being underweight can weaken your body and make it harder to recover. Being overweight can put extra strain on the liver, especially if liver disease is already present.
ProveniIncluded in official guidelines, or approved by EMA or FDA
Malnutrition worsens outcomes in liver disease; good nutrition management helps preserve muscle mass.
Regular weighing and consulting a dietitian with nutrition questions helps prevent you from developing malnutrition without noticing it. This is especially important if you have lung problems (such as coughing) and eat less because of them.
Salt, fluid, and liver
In advanced liver disease, salt restriction is sometimes necessary because the damaged liver cannot handle fluid well. This is something your healthcare provider will specifically tell you; it is not standard for everyone with AAT deficiency.
The same applies to fluid intake: depending on how your liver is functioning, your doctor may ask you to drink more or less. This is personal and may change over time.
Alcohol
Alcohol puts extra strain on the liver, especially for someone with AAT deficiency where the liver is already struggling with protein buildup.
Advised againstiProven ineffective or harmful, or dangerous in combination with your treatment
Alcohol use accelerates liver disease in AAT deficiency and is not recommended.
Vitamin deficiencies
Because the liver stores vitamins and your intestines must absorb them, deficiencies can develop. This especially applies to vitamins A, D, E, and K.
ProveniIncluded in official guidelines, or approved by EMA or FDA
Deficiencies in fat-soluble vitamins are more common in AAT deficiency with liver disease; monitoring through blood tests is standard.
Whether you need supplements depends on your blood values. This is determined by your doctor or dietitian, not by yourself. Some vitamin supplements can interact with medications you are taking (for example, vitamin K and blood thinners), so this must always be discussed.
Foods and symptom management
For people with lung problems, strong-smelling food can sometimes cause extra discomfort, and food that requires a lot of effort to eat (hard, dry) can be unpleasant. Soft, nutritious food can help: soups, porridge, fruit, yoghurt. This is not a cure, but it can make eating somewhat easier.
There is no evidence that certain foods can 'cure' or stop AAT deficiency itself. Supplements with certain substances (such as NAC, antioxidants or specific herbs) are not proven to be effective and can in some cases interact with your medications.
UnproveniNo scientific evidence that it works
Nutritional supplements as a treatment for AAT deficiency have no scientific evidence.
Working together with your treatment team
The best approach to nutrition is personalised: depending on how your liver works, what medications you take, whether your weight remains stable, and whether you have digestive problems. A dietitian familiar with liver disease or lung disease can help you create a nutrition plan that suits your situation.
Always tell your doctor if you experience changes with food (decreased appetite, nausea, change in taste) or if you lose a lot of weight. This can be a sign that your nutrition needs to be adjusted.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._