If you care about animal suffering, remember not all animals are the same, there is a continuous line of intelligence between some grass and a dolphin, you have to decide at what point you value. Pig? Chicken? Egg? Insect? Salmon? Sardine? Fungus? Starfish?

From my understanding, cutting out most mammals from your diet would cut out most of the more intelligent animals you eat. (Unless you eat crows or octopus)