Catfish

Food · Protein · Food, Typed Supps

Catfish is a mild, budget-friendly fish loaded with protein and B12 — and being a "bottom feeder" doesn't make it dirty.

Stage by stage

Chewing & Swallowing (Mouth): Chewing breaks catfish's flaky flesh into smaller pieces and mixes it with saliva to begin digestion.
Protein Breakdown (Stomach): Stomach acid and pepsin denature and begin breaking down the fish's proteins into peptide chains.
Nutrient Absorption (Small intestine): The small intestine absorbs amino acids along with vitamin B12, selenium, and phosphorus released from the fish.
Tissue Repair & Use (Muscle & blood): Amino acids and selenium travel via the bloodstream to repair muscle tissue and support antioxidant enzyme systems.

Timing

Catfish's fat-soluble nutrient content is modest, so it can be eaten at any meal without much regard to timing; pairing it with a source of healthy fat can help absorb the small amount of vitamin D it contains.

Time to effect

Hours to weeks: Amino acids from catfish protein begin appearing in the bloodstream within 1-2 hours of eating and support muscle repair for several hours, while B12 and selenium status build gradually with regular intake over weeks.

Allergens

Contains: Fish. Derived from what this food is, not from a product label.

Eating patterns

Fits: Pescatarian, Keto, Gluten-free. Depends on the product: Halal, Low-FODMAP.

Satiety

189 on the satiety index, where white bread is 100 — high. Modelled from the Holt et al. (1995) measurements.

Environmental footprint

13.6 kg CO2e and 3691 litres of freshwater per kg, matched to "Fish (farmed)" in Poore & Nemecek (2018), Science 360.

Cost band

Mid — roughly £11 per kg, as a band midpoint rather than a price.

Key nutrients

Nutrition per 100g

Calories: 105
Protein: 18.5g
Carbohydrate: 0g
of which sugars: 0g
Fat: 2.9g
of which saturated: 0.7g
Fibre: 0g
Sodium: 50mg

Food vs. supplement

Catfish delivers complete protein, B12, and selenium together in a low-mercury, budget-friendly package that a single-nutrient supplement can't replicate, though farmed catfish is a comparatively poor source of omega-3s and vitamin D versus fatty fish like salmon.

Kitchen tip

Bake, grill, or blacken catfish rather than deep-frying to keep it a lean, low-calorie protein source; always cook it to an internal temperature of 145°F to eliminate foodborne pathogen risk.

Common myth

"Catfish are dirty bottom-feeders, so they're less healthy or more contaminated than other fish." In reality: Catfish scavenge along river and pond bottoms just like many prized seafoods (shrimp, lobster, flounder, sole), and FDA/EPA joint guidance lists catfish among the "Best Choices" fish lowest in mercury, safe for regular consumption including by pregnant and breastfeeding women; farmed catfish raised in monitored ponds are especially well-controlled for contaminants.