Can You Eat Leftover Crayfish Overnight? Parasites and Food Pairing Taboos Explained

Crayfish meat is delicious and easily absorbs flavor, and it long ago conquered the main market of night market stalls, becoming a food everyone loves to talk about. So can leftover crayfish be eaten overnight? Does it have parasites? What foods can it not be eaten with?

1. Can leftover crayfish be eaten overnight

Never eat leftover crayfish overnight! We often see news reports of people rushed to the hospital for emergency treatment after food poisoning caused by eating overnight spicy crayfish. Why is that? Because overnight crayfish have a higher protein content, creating ideal conditions for bacteria to multiply, allowing bacteria to grow exponentially, and even heating makes it hard to kill them all.

2. The harms of overnight crayfish

1. Worse taste

After crayfish are cooked, being stored at room temperature for a long time causes the protein in the crayfish meat to break down, the meat to become tough, the taste to worsen, and the nutritional value to be far lower than before. In addition, after protein breaks down it can harm the human kidneys.

2. Heavy metal poisoning

Crayfish live in river channels and are a type of scavenging animal, and most rivers today are polluted by industrial wastewater. So crayfish contain a certain amount of heavy metals, especially concentrated in the head. After cooked crayfish are left sitting for a long time, the heavy metal substances in the head spread to other parts, and eating them may lead to heavy metal poisoning.

3. Cancer risk

After cooked food is left for a long time, it produces a certain amount of nitric acid and nitrous acid, and after eating it these convert in the human body into nitrates and nitrites, harming health and possibly causing cancer.

3. Do crayfish contain parasites

Crayfish contain parasites, and they must be cooked thoroughly at high temperature before eating!

Crayfish mostly grow in river silt and are unavoidably contaminated by parasites, becoming hosts to many parasites such as blood flukes, liver flukes, and lung flukes. The most common parasite in crayfish is the lung fluke, and once it enters the human body through eating undercooked crayfish meat, it easily causes lung fluke infection. Lung flukes can travel within the human body and can survive for one year or even several years, causing other complications and infections.

Therefore, before using crayfish you must clean them thoroughly. Not only should you scrub off the surface mud and sand with a brush, but you should also quickly remove the digestive tract, which hides large amounts of bacteria. When cooking crayfish, be sure to maintain a high temperature of 100°C and cook continuously for more than 5 minutes, as only this can effectively kill the parasites inside the crayfish.

4. What foods crayfish cannot be eaten with

5. Who should not eat crayfish

1. People prone to allergies

Crayfish is a trigger food, and for people prone to allergies it easily causes various allergic symptoms and puts a burden on the body.

2. People with respiratory system diseases

Crayfish are usually cooked with many strongly irritating seasonings such as chili and garlic, and for people with respiratory system diseases this can worsen the condition and cause other adverse reactions.

3. People with gout

Crayfish contain large amounts of marine purines, which will worsen the condition of people with gout.