Perda de apetite

What causes loss of appetite?

Normally most people have a regular desire to eat food - an 'appetite'. Eating is an essential part of life, giving us the energy and nutrients our bodies need to stay healthy. If you lose your appetite, there is usually a reason behind it, and it often has a medical or psychological cause. Most often, having no appetite is a short-term problem.

Most of us have experienced this with a flu-like viral illness ou tummy bug (gastroenteritis), or in times of extreme stress (such as an exam or a bereavement). Sometimes, however, it can go on for the long term. In this case, it may signify a more important medical problem.

There are many reasons why appetite may be lost. Some are serious conditions, others are not. Possible causes include:

• Infection. This includes short-term infections (such as gripe, common colds, urine infections, infecções no peito, tummy bugs, etc) and more long-lasting infections such as tuberculose (TB) ou teste de HIV. Usually there will be other symptoms specific to the infection.

• Medication. Many medicines can cause loss of appetite as a side-effect, including some antidepressivos such as fluoxetina, methylphenidate used for TDAH, chemotherapy, some medicines for type 2 diabetes, e strong painkillers (opiates).

• Mental health issues such as stress and ansiedade.

• Depressão. A loss of appetite can be a symptom of depression, along with other symptoms such as low mood, loss of concentration, and poor sleep.

• Conditions causing falta de ar. If it is difficult to breathe, it may be hard to eat at the same time as breathe. Medical conditions causing this might include doença pulmonar obstrutiva crônica (DPOC), pneumonia, asma, embolia pulmonar, e insuficiência cardíaca congestiva.

• Refluxo ácido e indigestão.

• Problems with the mouth and teeth. Any problem which makes it difficult to chew food, swallow it or taste it might interfere with appetite. For example, toothache, poorly-fitting dentures, abscessos dentários, a dry mouth, jaw dysfunction or loss of taste.

• Congestion of the nose and surrounding areas due to alergias, pólipos, or infections.

• Conditions affecting the guts, including doença celíaca, Doença de Crohn, colite ulcerativa, aguda, e diverticulite.

• Fibrose cística. This is an inherited condition which can affect appetite through the damage it causes to the lungs and pancreas.

• Cálculos biliares. These can cause severe pain particularly after eating fatty foods.

• Câncer. Many different cancers can cause loss of appetite, and many treatments for cancers cause loss of appetite. Usually lack of appetite is accompanied by other symptoms specific to that particular cancer, but sometimes loss of appetite can be an early cancer symptom.

• Constipação.

• Diabetes mellitus.

• Glândula tireoide hipoativa (hipotireoidismo).

• Disruption to the senses. Enjoyment of eating is enhanced by seeing the food, smelling it and tasting it. So if any of these senses are lost, it can have an effect on appetite - ie if there is loss of vision, loss of taste or loss of smell.

• Excesso de álcool ou use of illicit drugs.

• Anorexia nervosa. Extreme weight loss and a fear of food can reduce appetite.

• Age. Appetite tends to decline as people get older, and they may naturally eat less. This may be due to another cause, such as one of the above, or due to a decline in activity. Also the stomach empties more slowly in older age, so older people may feel full for longer.

• Long-lasting (chronic) health conditions such as chronic pain, chronic kidney disease, chronic liver disease e demência.

If a loss of appetite persists, and there is no obvious reason for it, see your GP. As you can see above, there is a huge list of potential causes. Your GP will want to rule out the more serious causes - in particular, cancer. In the meantime, you might find that eating small meals, or sticking to bland foods may help.

It is particularly important to see your GP as soon as possible if you have any of the following symptoms associated with a persisting lack of appetite:

• Perda de peso não intencional.

• Dificuldade para engolir.

• Pain in your tummy (abdominal pain).

• Swelling of your tummy.

• Suores noturnos.

• Sentindo-se mal (náusea).

• Cansaço.

• Humor deprimido.

• Sentindo falta de ar.

• Blood in your stools when you open your bowels.

Your GP will be able to narrow down the possible causes of loss of appetite by asking you about your symptoms and examining you. He or she will probably suggest some exames de sangue, which may give clues as to the cause. An ultrassonografia of the tummy may be helpful in some cases, and/or a chest X-ray. Further tests may then be indicated depending on what the likely diagnosis seems to be.

This will entirely depend on the cause which is found. Generally speaking, the most important thing is to establish the cause so that it can be quickly treated if possible. Your appetite keeps you eating, which keeps you healthy and strong. See the separate leaflet called Healthy Eating for more information.