feeling sick after eating greasy food remedy

Written by Dr.Bayat
Associate Professor of Orthopedic expert,Brigham Hostpital


If you feel unwell following bulky and high-fat foods,

If you feel sick following fatty foods,

If your stomach feels uncomfortable after eating a fatty meal

If you want to know how to overcome the discomfort after eating greasy food and how to eliminate it, we recommend that you read more. 

In the following, we will discuss the causes and show some easy ways to eliminate this annoying feeling.

You should note that each of the above has different causes, which are explained in detail below:





What causes you to feel uncomfortable after a meal?

Many conditions can make you feel bad in your stomach after a meal or feel sick and unhappy after eating a large and fatty food. A simple food poisoning or even a sign that you are pregnant can be the underlying cause of this illness after eating rich foods. It is best to examine the accompanying signs and symptoms more carefully to determine the cause of your condition. Often, nausea and vomiting will accompany the symptoms of this illness.

If you feel sick following a fatty or bulky meal, you may have this feeling for one of the following reasons:


  • Food allergies:

Many foods, especially fatty foods containing eggs or seafood, can irritate some people's immune systems. And the immune system may release Histamine or other chemicals that can cause allergic symptoms. In addition, they can cause mouth, tongue, and upper respiratory tract swelling, urticaria, and even vomiting.

Milk and milk-derived products like cheese can cause food allergies.


  • Toxins in food:

Foods that contain large amounts of fat and are stored incorrectly for a long time can have a variety of viruses, parasites, and bacteria.

Consumption of these foods may cause you various symptoms as follows:

  • Lethargy and boredom
  • Nausea
  • Vomit
  • Diarrhea

Usually, if the cause of your discomfort after a heavy meal or fatty foods is toxins, you will develop symptoms in the first few hours after eating.

Food poisoning may cause many different signs and symptoms in our body, from headaches and feeling sick to unconsciousness and death, depending on the type and the amount of the toxin taken.


  • Gastric acid reflux:

If you have eaten fatty and bulky food and then feel bored and lazy, especially if you have heartburn or soreness in the back of your throat or you feel that the taste of the food you have swallowed is stuck in your throat and something is stuck in your throat, then the causative factor may be gastroesophageal reflux disease or GERD.  

GERD happens when there is a return of gastric acid to the esophagus. The classic symptom of esophageal reflux is heartburn, which usually worsens after eating fatty and greasy foods or sleeping right after meals.

These people suffer from discomfort and even nausea after eating fatty foods. It is said that fats and greasy foods cause the lower esophageal sphincter, which is located between the esophagus and the stomach, to relax.

As the lower esophageal sphincter relaxes, gastric juice return increases.


  • Pregnancy:

Another cause that can make you feel sick, full, lethargic, bored, and sometimes nauseous after eating fatty foods is pregnancy.

Usually, these symptoms start around the second month of pregnancy. It is said that hormonal changes during pregnancy cause these conditions in pregnant women.

An increase in Progesterone hormone during pregnancy relaxes the esophageal sphincter and increases the chance of gastric reflux into the esophagus. This condition is sometimes called Morning sickness.

But it is interesting to know that nausea and discomfort can occur in pregnant women in early pregnancy at any time of the day and during eating. Even the smell and taste of food can cause lethargy, nausea, and boredom.


  • Gallstones:

The gallbladder is a small sac that is part of the structure of the human liver. The gallbladder is the place where bile secretions are stored. Bile is produced by bile cells in the liver.

Bile fluid is needed to digest fats properly.

When fat molecules move from the stomach into the small intestine, the gallbladder starts to contract and secretes bile into the small intestine.

If someone suffers from gallstones and has some inflammation in the gallbladder, they will experience pain and unpleasant feeling when taking greasy foods.

Therefore, these people will suffer from lethargy and boredom, sharp pain in the right side of the abdomen, which shoots in the right shoulder, followed by greasy foods.


  • Bile duct stenosis:

Inflammation, stones, tumors, and other causes can block the bile passage through gallbladder into the small intestine, and some symptoms may happen after a greasy meal.

You may have bile duct stenosis if you experience changes in your stool or urine color and feel sick after greasy foods.


  • Acute or chronic pancreatitis:

The pancreas is a gland responsible for the secretion of various hormones like insulin, aside from its functions in fat digestion.

Many factors may lead to pancreas inflammation or pancreatitis, varying from alcohol consumption and some medications to virus infections.

The most common cause of acute pancreatitis is gallstones, meaning that the gallstones block the outlet of the pancreas and obstruct the duct.

This obstruction in the passage of pancreatic enzymes will lead to inflammation of the pancreas and various symptoms like pain and sickness after greasy and fatty foods.

One with inflammation of the pancreas or acute or chronic pancreatitis has inflammation and damage to the pancreas.

These patients may experience nausea and upper abdominal pain especially following fatty foods.

They may also experience nausea, vomiting, and pain in other areas of the abdomen and chest.


This syndrome is called IBS for short. One with IBS can have a set of symptoms for unknown reasons. They may develop the following symptoms after eating large or fatty foods:

  • Abdominal pain
  • Nausea
  • Feeling bored
  • Diarrhea
  • Constipation which is less common following fatty food.


  • Those who undergo chemotherapy:

Those treated with chemotherapy drugs to treat the tumor and cancer can experience some sickness and nausea after eating fat and fatty foods. 

Almost always, these problems will resolve when the chemotherapy ceases.


Those with lots of stress and anxiety and those who are very sensitive to movement may experience nausea and condition as they eat a greasy and fatty meal.


  • Stomach Flu:

One of the most common terms the general public uses is Stomach Flu. Stomach flu is when a factor causes inflammation in your stomach and digestive system. Infectious Gastritis is the medical term for stomach flu.

 In these cases, the following symptoms occur:

  • Nausea
  • Vomit
  • Diarrhea

And the unpleasant feeling comes to you after eating, especially fatty and bulky foods.

Stomach flu may occur following the transmission of the pathogen from an infected person to you, or it may be transmitted to you following eating or drinking water or food from an infected container.


  • Fatty liver:

As the term implies, the accumulation of fats in the liver may cause fatty liver, interfere with normal liver functions of the liver, and causes different kinds of symptoms that may happen or worsen with heavy and greasy meals.


Gastric ulcers and erosions caused by infectious and non-infectious agents may cause many problems with fatty and greasy foods.


There are many causes for the development of inflammation in the stomach that can be infectious or non-infectious.

Some medications like Aspirin and Advil can cause gastritis.


Accumulating waste materials like uric acid may lead to a condition named uremia which will cause sickness and problems while eating fatty and greasy foods and diets high in proteins.


  • Chronic renal failure or CRF:

Any kidney function problem may cause uremia and waste materials collection in our body, leading to sickness and problems while eating foods.


When should we see a doctor?

Feeling sick after eating foods, especially fatty and greasy, is an important sign and needs more attention and medical consultation.

Consider it a warning if you experience nausea and vomiting immediately after eating. Although most of the time, this symptom does not indicate a severe underlying disorder. It is best to consult a doctor immediately.

In the following cases, a visit to the doctor should be made immediately:

  • If there is blood in your vomit
  • If there is blood in your stool
  • If you have chest pain
  • If you have diarrhea that has lasted for more than a few days and has not improved,
  • if you feel unwell after eating fatty foods, you feel very thirsty, and you have little urination
  • You feel weak and lethargic
  • If you have a fever above 38.6 degrees Celsius or 101.5 degrees Fahrenheit
  • If you feel severe and progressive pain in your abdomen and chest
  • If you feel your heartbeats
  • If you have an intolerance to food and vomit whatever you want
  • If you feel weak and have a low level of consciousness
  • Have changes in your stool and urination color
  • Have recent significant stress
  • Start new medication for some other issue
  • Have diabetes or kidney problems


If children below the age of six experience one or more of the following symptoms, a pediatrician should be consulted immediately:

  • If the child vomits for more than a few hours
  • If there are signs of dehydration such as dry skin and lack of tears.
  • If your child has a fever above37.8degrees Celsius and 100 degrees Fahrenheit
  • if he has diarrhea that does not stop
  • If you have a child over six with one or more symptoms, you should consult a pediatrician immediately.
  • If the child has diarrhea and vomiting for more than a day
  • If there are signs and symptoms of dehydration, for example, your child does not have enough and frequent urination or does not have tears.



Suppose you are experiencing gastrointestinal symptoms, lethargy and nausea after eating and want to get rid of these conditions quickly. In that case, you should know that diagnosing the cause of the disease in the first place is very important.

When you see a doctor with the above complaint, the doctor will perform a clinical examination of your condition after hearing your history and examining your signs and symptoms. Depending on your situation, paraclinical methods and tests may also help make a diagnosis:

  • blood test
  • Urine tests
  • Skin test to identify allergies
  • Upper endoscopy to detect esophagitis gastritis or the presence of signs and symptoms of gastric acid entering the esophagus
  • X-ray imaging
  • CT scan and ultrasound
  • M.R.I
  • Flexible sigmoid colonoscopy


How to get rid of bad feelings after eating greasy foods?

As mentioned above, many issues can be responsible for feeling sick after greasy meals.

Some of these causes will resolve spontaneously without any intervention, like what is seen in IBS.

But some other causes like gallstones or pancreatitis need immediate medical intervention.


In the following, we will tell you how to get rid of the annoying symptoms following eating:

By the way, drinking some lemon juice or sour drinks may help your stomach to digest the fatty food as soon as possible.

Remember to visit your doctor if you have any of the above-described symptoms under the “ when to see a doctor” section.


  • Chemotherapy or medication:

Suppose you are taking your chemotherapy session or taking medication that cannot be changed or stopped. In that case, the anti-nausea medication prescribed by your doctor can be an excellent choice to get rid of sickness followed by a greasy meal.

 It is also better to have low-fat meals and use fresh, soft, and easy-to-digest foods such as soups and purees.


  • Food allergies:

If the cause of your problem is diagnosed as food allergies, you should avoid irritating and spicy foods.

Milk and dairy products are responsible for most food allergies.


  • IBS:

If the cause of the symptoms after eating large and fatty foods is diagnosed as IBS, then you should avoid foods that irritate your symptoms and stresses.

Acupuncture may be helpful in these cases.


  • Gastroesophageal reflux disease or GERD:

If your symptoms occur following gastroesophageal reflux disease, it is recommended that you follow the recommendations and items below:

  • Keep your weight as fit as possible and avoid obesity and overweight
  • Use the suitable antacids
  • Avoid spicy and high-fat foods
  • It is better not to sleep or lie down for a few hours after eating
  • Do not lean forward and use a bit high pillow under your head when sleeping
  • It is better to avoid wearing tight pants and tight belts


  • Gallstones and gallbladder problems:

If the cause of your illness following the fatty foods is gallbladder disease, you must consult a doctor.

If you have symptoms due to diseases of the gallbladder and biliary system, in addition to feeling unwell, you may have one or more of the following symptoms:

  • Nausea
  • Vomit
  • Upper abdominal pain that spreads to the right shoulder and scapula
  • Yellowing of the skin
  • Yellowing of the sclera of the eye
  • Dark urine
  • White-colored stool
  • Decreased appetite and feeling full stomach
  • Flatulence

In some cases, gallstones may be treated with certain medications, but surgery to remove a defective gallbladder, called a cholecystectomy, is often necessary.


  • Pregnancy:

 If your symptoms occur during pregnancy, do not worry, you and your fetus will not be in danger if you follow your doctor’s advice. We recommend that you eat soft, low-fat, spice-free foods.


  • Motion sickness:

If you have motion sickness, be sure to sit in a place with the slightest motion throughout your trip, for example, in front of a train or on the wing of an airplane, and it is better to use anti-motion sickness drugs before your journey begins.


  • Indigestion:

If you have indigestion, follow these tips:

  • It is better to suck a piece of ice
  • It is better to use organic and fresh foods.
  • It is best to rest for a few days so that your immune system can cleanse your body


  • Stresses and anxiety:

If stress and anxiety cause you to experience the above conditions after eating, it is better to use relaxation techniques such as meditation and yoga.

If you have recent significant stress, be sure to see your doctor as soon as possible.


  • Pancreatitis:

If you have a history of pancreatitis or experience sharp, sudden pain in your abdomen following a fatty meal, it is a severe symptom and should be evaluated by your doctor.


The final word:

Feeling sick and unsatisfied after eating fatty and bulky foods is regular. Following the tips mentioned in the previous sections will help you regain your everyday life quickly. Remember that a day of overeating does not cause weight gain, and you will not lose weight with a day of dieting.


Written by Dr.Bayat
Associate Professor of Orthopedic expert,Brigham Hostpital


  • Sicherer SH, Sampson HA. Food allergy: epidemiology, pathogenesis, diagnosis, and treatment. J Allergy Clin Immunol.

  • Scheuermann U, Widyaningsih R, Hoppe-Lotichius M, Heise M, Otto G. Detection of benign hilar bile duct stenoses—a retrospective analysis in 250 patients with suspicion of Klatskin tumour. Ann Med Surg (Lond).

  • Houghton LA, Lea R, Agrawal A, Agrawal A, Reilly B, Whorwell PJ. Relationship of abdominal bloating to distention in irritable bowel syndrome and effect of bowel habit.

  • Hegarty JE, Nouri Aria KT, Portmann B, Eddleston AL, Williams R. Relapse following treatment withdrawal in patients with autoimmune chronic active hepatitis.

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Address: 393 University Avenue,Suite 200,Toronto ON MG5 2M2,CANADA

Email: info@MarsoClinic.com

Phone: +1(647)303 0740

All Rights Reserved © By MarsoClinic

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