Grilled tuna loses 20–30% of its weight. Moisture evaporates first (Sobral et al., Compr Rev Food Sci Food Saf 2021). Per 100 g: 108 kcal, 23.4 g protein, 0.9 g fat. A raw 170 g steak becomes roughly 120 g seared. Log the stage you eat.
How should I track Tuna, yellowfin, raw?
Tuna, yellowfin, raw is high in protein. For the most accurate tracking of Tuna, yellowfin, raw, weigh it raw and boneless. Fish loses 15–25% of its weight during cooking as water evaporates (USDA cooking yield data). If you are using canned fish, the drained weight is what matters — the difference between oil-packed and water-packed can be 40–80 calories per can. A quick drain-and-weigh habit saves you from hidden calories. Also keep in mind that smoked or cured fish has different values than fresh due to moisture loss and added salt.