Brenda Khan
Phenylketonuria (PKU) is an inborn error of phenylalanine metabolism caused by a deficiency in the enzyme phenylalanine hydroxylase, which converts phenylalanine into tyrosine. The PKU diet is a life-long, low-protein diet for anyone with PKU. It involves restricting natural protein or dietary phenylalanine to 25% or less of a regular intake to maintain blood phenylalanine concentrations within the target range. This usually requires the avoidance of all high-protein foods such as meat, chicken, fish, eggs, and cheese derived from animal milk. In addition, people with PKU must take an amino acid supplement to ensure they're getting all the nutrients required for normal growth and good health.
| Characteristics | Values |
|---|---|
| Purpose | To maintain blood phenylalanine concentrations within the target range |
| Food to avoid | High protein foods such as meat, chicken, fish, eggs, cheese derived from animal milk (cow, goat, sheep) |
| Food to eat | Low-protein versions of common foods such as flour, rice, pasta, bread, biscuits |
| Food to limit | Fruits and vegetables, potatoes |
| Additional requirements | Amino acid supplements, phenylalanine-free formula |
| Special populations | Infants and children must follow the PKU diet strictly; women with PKU who are considering pregnancy should aim for phenylalanine levels within the target range before conceiving |
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What You'll Learn
The PKU diet is a life-long commitment
The PKU diet involves avoiding or restricting all high-protein foods, such as meat, chicken, fish, eggs, and cheese derived from animal milk. High-protein foods are typically restricted to 25% or less of a regular intake. In addition to protein restriction, it is important to monitor portion sizes, even when choosing foods from the compliant list, as all foods except fats, oils, and sugars contain some amount of phenylalanine.
To ensure they are getting all the necessary nutrients, those on the PKU diet must take a specially designed, phenylalanine-free medical nutrition food or amino acid supplement. These supplements provide about 70% to 85% of their protein and help promote normal growth, prevent protein deficiency, and optimise blood phenylalanine control. It is recommended to work with a dietitian or healthcare provider to tailor the diet to individual needs, taking into account phenylalanine levels, protein intake, and lifestyle.
Sticking to the PKU diet can be challenging, especially when away from home or during social gatherings. Planning meals in advance and having some go-to take-along options can help. The cost of medical foods can also be a barrier, although they may be covered by health insurance as necessary medications.
The PKU diet is particularly critical for infants, children, and women who are pregnant or planning a pregnancy. High phenylalanine levels can harm an unborn child, and children with PKU are at risk of detrimental changes in their brain development if they do not strictly adhere to the diet. For adults, deviating from the PKU diet can lead to adverse effects such as headaches, mood issues, memory problems, and decreased concentration and reaction time, which can usually be reversed by returning to a strict low-phenylalanine diet.
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High-protein foods are forbidden
A low-protein diet is the main treatment for PKU. People with PKU must also take an amino acid supplement, such as Phenyl-Free, to ensure they are getting all the nutrients required for normal growth and good health. These supplements provide about 70% to 85% of an individual's protein needs. In addition, there are several low-protein versions of common foods, such as flour, rice, and pasta, that are specifically designed for people with PKU and can be incorporated into their diets.
It is important to note that PKU is a life-long diet, and infants, children, and adults with PKU must strictly adhere to it. High levels of phenylalanine in a child's body can cause seizures and irreversible damage to their brain, resulting in permanent intellectual disability. Even for adults, high phenylalanine levels can lead to problems with attention, concentration, memory, and reaction time. Therefore, it is crucial to monitor blood phenylalanine levels regularly and adjust the diet accordingly.
While on the PKU diet, it is essential to be mindful of portion sizes, as all foods, except fats, oils, and sugars, contain some amount of phenylalanine. Additionally, aspartame, an artificial sweetener made from phenylalanine, should be avoided. Sticking to the PKU diet can be challenging, especially when travelling, attending social events, or eating out. However, planning meals in advance and having some go-to take-along options can help individuals with PKU stay on track.
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Phenylalanine-free formula is essential
Phenylketonuria (PKU) is an inborn error of phenylalanine metabolism caused by a deficiency in the enzyme phenylalanine hydroxylase, which converts phenylalanine into tyrosine. The PKU diet is a life-long diet that requires strict adherence, especially for infants and children, as high levels of phenylalanine can cause seizures and irreversible brain damage, resulting in permanent intellectual disability.
In addition to the formula, those on a PKU diet must carefully select low-phenylalanine foods, such as certain fruits and vegetables, and avoid high-protein foods like meat, chicken, fish, eggs, and certain types of cheese. It is important to work with a dietitian or healthcare provider to tailor the diet to individual needs, including phenylalanine levels, protein goals, dietary preferences, and lifestyle.
The PKU diet can be challenging to follow, especially when away from home, and the cost of medical foods can be a barrier. However, proper planning and having go-to meals and snacks can help. It is also important to note that some adults with PKU may have higher phenylalanine levels due to difficulties adhering to the low-protein diet or returning to a normal diet. Adverse effects, such as loss of concentration or slower reaction time, can be reversed by going back to a strict PKU diet and lowering phenylalanine levels.
For women with PKU who are considering pregnancy, it is crucial to resume a strict low-phenylalanine diet before and during pregnancy, as high phenylalanine levels can harm the unborn child. Regular blood tests and frequent contact with a dietitian are recommended to monitor phenylalanine levels and ensure the health of both mother and baby.
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Supplements are required for nutrients
Phenylketonuria (PKU) is an inborn error of phenylalanine metabolism caused by a deficiency in the enzyme phenylalanine hydroxylase, which converts phenylalanine into tyrosine. The PKU diet is a lifelong diet for anyone with PKU. The main treatment for PKU is a low-protein diet and controlled intake of many other foods, such as potatoes and cereals. High-protein foods should be completely avoided.
People with PKU must take a phenylalanine-free medical formula, such as Phenyl-Free, to supplement their diet. This formula contains protein, vitamins, minerals and energy (calories) with no phenylalanine. This is because a low-phenylalanine diet can lead to a lack of protein, vitamins and minerals. The amino acids in these supplements are very rapidly oxidized compared to the amino acids in whole foods, so protein needs are higher for someone relying on these medical foods for protein. In addition, people with PKU must take an amino acid supplement to ensure they're getting all the nutrients required for normal growth and good health.
Children (over the age of 4) and adults require 120% to 140% of the reference daily intake of protein for their age. The protein needs for infants are dependent upon their age but average around 2.5 grams of protein per gram of body weight. For children up to age 4, protein needs are 1.5 to 2.1 grams per kilogram of body weight. Your healthcare provider can tell you how much protein you need each day and what your daily phenylalanine goal should be.
There are also several low-protein versions of common foods (such as flour, rice and pasta) specifically designed for people with PKU and related conditions to incorporate into their diets. Many of these are available on prescription.
In addition, it is important to monitor vitamin, mineral and essential fatty acid status, especially in those who do not consume sufficient AA formula. Given the growing population of adults with PKU, further research is needed to understand the risks for developing osteoporosis and cardiovascular disease. There is evidence to suggest that deficient intake or altered metabolism of the B vitamins, B6, B12 and folate, contributes to elevated homocysteine, which increases the risk of thrombosis, atherosclerosis and stroke.
The PKU diet is easiest to follow when you're at home and preparing your own meals. If you're travelling, attending parties or celebrations, or gathering with friends and family for the holidays, planning proper meals and sticking with the diet will be more challenging. It can help to have some go-to take-a-long meals and snacks in mind for when you need them.
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Dental care is important
People with PKU must follow a strict low-protein diet and control their intake of other foods such as potatoes and cereals. Phenylalanine, a type of amino acid, must be kept to a minimum. This is because high levels of phenylalanine can cause seizures and irreversible brain damage, resulting in permanent intellectual disabilities. To compensate for the lack of protein, people with PKU need to consume specially designed, phenylalanine-free medical nutrition food and amino acid supplements.
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Frequently asked questions
PKU stands for Phenylketonuria, an inborn error of phenylalanine metabolism caused by a deficiency in the enzyme phenylalanine hydroxylase.
The PKU diet is a low-protein diet with controlled intake of other foods such as potatoes and cereals. It involves taking a phenylalanine-free formula, such as Phenyl-Free, to make up for the protein and nutrients missed from the diet.
If you go off the PKU diet, you may experience headaches, mood issues, memory problems, and other cognitive concerns. It is advised that you consult a doctor or dietitian to monitor your blood phenylalanine levels and adjust your diet accordingly.
