Accidentally eating a few apple seeds is typically harmless. The seeds’ hard outer shell keeps the seeds’ contents from causing serious side effects. However, if seeds are crushed, chewed, or eaten in large amounts, they can be poisonous and lead to severe health problems.
Apple seeds can pose a choking risk, especially for young children and for people with conditions that make swallowing more difficult, such as neurological disorders, dysphagia (difficulty swallowing), or dental issues like missing teeth or unstable dentures.
Although apple seeds are small, they are firm and slippery, which makes them easy to inhale and more likely to get stuck in the airway. This risk is greater for children because of their narrower airways. To reduce the risk of choking, always remove the apple core and seeds before eating.
Apple seeds contain amygdalin, a compound also found in apricot pits, peach pits, and bitter almonds. Swallowing a few whole apple seeds usually causes no harm because the digestive system doesn’t break down the hard outer shell. If you chew, crunch, or eat a large number of seeds, your body metabolizes amygdalin into hydrogen cyanide, a highly toxic poison.
Symptoms of cyanide poisoning develop rapidly. Early signs can include:
- Headache
- Dizziness
- Anxiety
- Confusion
- Nausea
As poisoning progresses, people may develop:
- Difficulty breathing
- A racing heart
- Seizures
- Loss of consciousness
Without treatment, high levels of cyanide exposure can be fatal.
Although small amounts of apple seeds are unlikely to cause harm, chewing or swallowing several can sometimes irritate your digestive system. This may lead to minor symptoms such as stomach cramps, nausea, or bloating.
The irritation stems from two things:
- The release of small amounts of cyanide during digestion
- The seeds’ hard, fibrous texture, which can be more difficult for the digestive system to break down
People with certain digestive conditions, such as inflammatory bowel disease (IBD), can have difficulty digesting certain foods and may be more sensitive to these effects and experience more digestive discomfort or symptom flare-ups.
Although rare, some people are allergic only to apple seeds while tolerating the rest of the fruit. Food allergy symptoms can range from mild to severe. In rare cases, a severe reaction (anaphylaxis) can occur and requires emergency treatment.
Common symptoms of an allergic reaction to apple seeds may include:
- Runny nose
- Skin rash or hives
- Swelling of the lips, tongue, or mouth
- Nausea and vomiting
- Diarrhea
- Throat tightness
- Trouble breathing
- Dizziness, lightheadedness, or rapid heartbeat
- Loss of consciousness or seizures
Apple seeds contain a natural compound called amygdalin. When you chew or crush the seeds, your body metabolizes amygdalin into hydrogen cyanide, a highly poisonous substance.
Cyanide is dangerous, but you would need to eat a large amount of chewed seeds to experience poisoning. Research shows that about 0.5-3.5 milligrams of cyanide per kilogram of body weight can be toxic. For the average adult, this equals roughly 150 or more chewed apple seeds. The exact number varies depending on your body weight and the apple variety.
Swallowing whole seeds is generally safe because the hard outer shell prevents the release of amygdalin. Your body usually passes intact seeds through the digestive system without breaking them down. The main risk comes from chewing or crushing the seeds, which destroys the protective coating and releases the toxic compound.
