Sliced into Spam and found firm white chunks embedded throughout. Is that mold or something bad.

Once Spam is opened, it should be refrigerated and consumed within 3-5 days for optimal safety.
Keeping the product tightly sealed and stored in an airtight container can prevent mold growth. It’s also important to use clean utensils when handling Spam to avoid introducing contaminants.
9. What Food Safety Experts and the USDA Say About Canned Meats
According to the USDA, canned meats like Spam are safe for consumption when properly processed and stored. They recommend inspecting the can for any signs of damage or bulging before use.
The USDA advises following the expiration date for the best quality but notes that canned goods can remain safe long past their printed dates if stored correctly.
10. When to Contact the Manufacturer or Throw the Spam Away
If you notice anything unusual about your Spam, such as an off-odor, discoloration, or unusual textures, it may be best to contact the manufacturer for guidance.
If the can is damaged or you strongly suspect spoilage, it’s safer to discard the product to avoid any health risks.
11. Alternatives If You’re Uncomfortable Eating Those White Chunks
If the presence of white chunks in Spam is unappealing, consider alternatives such as low-fat or reduced-fat versions of canned meats, which may have less visible fat.

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Other options include cooking the Spam thoroughly, which can render the fat and integrate it more evenly into the meat, or opting for fresh meats if canned products are not a preference.