Key findings
- 1Canned sardines are among the least processed shelf-stable protein sources available
- 2The canning process softens bones, making them edible and adding significant calcium content
- 3Sardines in water or olive oil with salt are a 2-3 ingredient food regardless of the can
Why is Sardines Level 2 on average?
Sardine processing involves catching, cleaning, and packing the fish into cans with a liquid medium (water, olive oil, soybean oil, or tomato sauce) and salt. The sealed cans are then heat-sterilized (retorted), which cooks the fish and creates a shelf-stable product. This is purely thermal processing with no chemical additives needed. The bones soften during canning and become edible, adding calcium. Some flavored varieties add mustard, hot sauce, or lemon, which may introduce minor additional ingredients but remain simple overall.
How 444 sardines products break down
Share of products at each processing level, in our analysis.
Sardines brand comparison
From least to most processed in our database.
How to read a sardines label
- 1
The simplest sardines list: sardines, water (or olive oil), salt. 3 ingredients
- 2
Sardines in olive oil and sardines in soybean oil are equally simple; the difference is which oil is in the tin
- 3
Flavored varieties (lemon, mustard, hot sauce) typically add only a few natural ingredients
- 4
Watch for sardines in "tomato sauce" that list sugar, modified starch, or artificial flavors in the sauce
Ketzal for iPhone
Got Sardines At Home?
Scan yours in Ketzal to see how your exact product scores, not just the average, plus a less processed swap.
Scan It Free
Frequently asked questions
Are canned sardines ultra-processed?
Canned sardines are typically just fish, oil or water, and salt. Canning is a thermal preservation method, not an ultra-processing technique. In our analysis, sardine products average a Processing Score of 2.8, which is Level 2.
Are sardines in oil more processed than sardines in water?
No. Both are equally simple. The liquid medium (water vs. olive oil vs. soybean oil) does not change the processing level. The choice is nutritional and flavor preference, not a processing distinction.
Why do canned sardines last so long?
The canning process heat-sterilizes sardines inside a sealed container, killing all bacteria. No preservatives are needed; the sealed, sterile environment keeps them safe for 3-5 years. This is the same principle as home canning.