How to tell If tomato sauce is bad?

In this article, we will answer the question “How to tell If tomato sauce is bad?”, and we are going to discuss the health implications of eating bad tomato sauce.

How to tell If tomato sauce is bad?

There are several signs that can help you to determine if your tomato sauce has gone bad or not. Here are four common signs to look out for:

Important: if you are unsure about any of the following signs, you should consider discarding the sauce. eating spoiled tomato sauce can make you very sick (1-5). Remember that safety comes first!

  1. Appearance: Inspect the color and texture of your tomato sauce. If you notice any mold growth, dark spots, or discoloration that is different from its usual vibrant red color, it may be a sign of spoilage.

Be aware that molds can produce dangerous mycotoxins (6), so you should avoid eating tomato sauce contaminated with molds. 

  1. Odor: You should smell your tomato sauce. Fresh tomato sauce should have a pleasant, slightly tangy aroma. If you detect any foul or rancid smell, it could indicate that the sauce has gone bad and you should not consume it.
  1. Texture: Spoiled tomato sauce might also develop an unusual texture. If you notice any signs of separation, clumps, or an excessively watery consistency, this is a clear indication of spoilage.
  1. Finally the taste: When in doubt, taste a small amount of the tomato sauce (be careful! this could be dangerous). If the flavor is off, sour, or tastes unpleasant, it is likely spoiled and should not be consumed. Stop eating and throw it out immediately!

If you notice any of these signs, remember that it is always best to err on the side of caution and discard the tomato sauce to avoid any potential foodborne illnesses.

Can you get sick from eating spoiled tomato sauce?

Yes, eating spoiled tomato sauce exposes you to several health risks due to the presence of harmful pathogens (1-5). These pathogens can cause different foodborne illnesses, leading to various symptoms. 

Here are some examples of common pathogens associated with spoiled tomato sauce and the symptoms they can cause:

  • Salmonella: This bacterium is often found in raw or undercooked food, including tomatoes (2). Symptoms of salmonellosis may include diarrhea, abdominal cramps, fever, and vomiting. The illness typically develops within 12 to 72 hours after ingestion (7).
  • Clostridium botulinum: This bacterium can produce a toxin that causes botulism, a severe illness (3). Symptoms may include blurred vision, muscle weakness, difficulty swallowing, slurred speech, and respiratory problems. Be careful! In some cases, botulism can lead to paralysis or even be life-threatening (8).
  • Escherichia coli: Certain strains of E. coli, such as E. coli O157:H7, can grow on your spoiled tomato sauce and cause food poisoning (4-5). Symptoms may include severe diarrhea (often bloody), abdominal pain, vomiting, and fever. 

In some cases, it can lead to complications like hemolytic uremic syndrome (HUS), which affects the kidneys (9).

  • Staphylococcus aureus: This bacterium can produce toxins that cause food poisoning (5). Symptoms may include nausea, vomiting, abdominal cramps, and diarrhea.

It’s important to note that these pathogens can be present in spoiled tomato sauce, but not all cases of spoilage will necessarily lead to the presence of harmful bacteria. 

Nevertheless, consuming spoiled food increases the risk of encountering these pathogens, which can have serious health consequences. 

If you suspect you have eaten spoiled tomato sauce and experience any severe or persistent symptoms, it is advisable to seek medical attention immediately.

What should you do if you suspect you have eaten spoiled tomato sauce?

If you have consumed spoiled tomato sauce and you are experiencing symptoms of food poisoning, it is important to follow these recommendations:

  • Firstly, immediately stop consuming the sauce to prevent further ingestion of potentially harmful substances and microorganisms. 
  • Assess your symptoms (any symptom of food poisoning (10)), such as nausea, vomiting, diarrhea, abdominal pain, fever, and dehydration, noting their severity and duration. 
  • If your symptoms are severe, persistent, or worsening, seek medical advice from your healthcare provider or visit a medical facility. 
  • Stay hydrated by drinking plenty of fluids, especially water or oral rehydration solutions, to replenish lost fluids (11). 

Remember that It is essential that you prioritize caution and you dispose of your tomato sauce when in doubt  to minimize any potential health hazard.

How to properly handle tomato sauce to avoid spoilage?

To handle tomato sauce properly and prevent its spoilage, it is important that you follow the next recommendations:

  • When purchasing tomato sauce, check the expiration or “best by” date and ensure the packaging is intact. 
  • Store your tomato sauce in a cool, dry place away from sunlight, such as a pantry or cupboard. 
  • Unopened tomato sauce in cans or jars can last 1 to 2 years, but refer to the expiration date for accuracy. 
  • Once opened, refrigerate the sauce in airtight containers and use it within 5 to 7 days. 
  • For long-term storage, freeze the sauce in freezer-safe containers for up to 3 to 6 months. 

Finally, remember to use clean utensils, seal the container tightly, and discard any sauce showing signs of spoilage. 

Proper handling and storage practices will help maintain the quality and safety of your tomato sauce (12) .


In this article, we answered the question “How to tell If tomato sauce is bad?”, we also discussed the health implications of eating bad tomato sauce. 


1. Colombari V, Mayer MDB, Laicini ZM, Mamizuka E, Franco BDGM, Destro MT, et al. Foodborne outbreak caused by Staphylococcus aureus: phenotypic and genotypic characterization of strains of food and human sources. J Food Prot [Internet]. 2007 [cited 2023 May 22];70(2):489–93. Available from: 

2. Bartz JA. Raw Tomatoes and Salmonella. Prod Contam Probl [Internet]. 2009 Jan 1 [cited 2023 May 22];223–47. Available from: 

3. Huhtanen CN, Naghski J, Custer CS, Russell RW. Growth and toxin production by Clostridium botulinum in moldy tomato juice. Appl Environ Microbiol [Internet]. 1976 [cited 2023 May 22];32(5):711–5. Available from: 

4. Eribo B, Ashenafi M. Behavior of Escherichia coli O157:H7 in tomato and processed tomato products. Food Res Int [Internet]. 2003 Jan 1 [cited 2023 May 22];36(8):823–30. Available from: 

5. Fatima D, Mebrouk K, Miloud H. Control of E. coli and spoilage microorganisms in tomato sauce and paste using a synergistic antimicrobial formula. J Chem Pharm Res [Internet]. 2015 May 31 [cited 2023 May 22];7(5):29–60. Available from: 

6. Pleadin J, Frece J, Markov K. Mycotoxins in food and feed. In: Advances in Food and Nutrition Research [Internet]. Academic Press Inc.; 2019 [cited 2020 Apr 27]. p. 297–345. Available from: 

7. Turnbull PCB. Food Poisoning with Special Reference to Salmonella — Its Epidemiology, Pathogenesis and Control. Clin Gastroenterol [Internet]. 1979 Sep 1 [cited 2023 May 3];8(3):663–714. Available from: 

8. Ting PT, Freiman A. The story of Clostridium botulinum: from food poisoning to Botox. Clin Med (Northfield Il) [Internet]. 2004 May 5 [cited 2023 May 3];4(3):258. Available from: 

9. Siegler RL. The Hemolytic Uremic Syndrome. Pediatr Clin North Am [Internet]. 1995 Dec 1 [cited 2023 May 21];42(6):1505–29. Available from: 

10. Milaciu M V, Ciumărnean L, Orășan OH, Para I, Alexescu T, Negrean V. Semiology of food poisoning. Int J Bioflux Soc [Internet]. 2015 [cited 2023 May 10];8(2):108–13. Available from: 

11. McRobert GR. THE TREATMENT OF BACTERIAL FOOD POISONING. Br Med J [Internet]. 1934 Aug 8 [cited 2023 May 10];2(3841):304. Available from: 

12. Dudeja P, Singh A. Safe cooking practices and food safety in home kitchen and eating establishment. Food Saf 21st Century Public Heal Perspect [Internet]. 2017 Jan 1 [cited 2023 May 3];373–85. Available from: ttps:// 

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