Here's why:
* Tuna is a muscle tissue: Tuna is a fish, and fish are primarily composed of muscle tissue, which is protein.
* Starch is a carbohydrate: Starch is a complex carbohydrate found in plants, like grains, potatoes, and beans.
* Fish do not contain starch: Fish do not have the same biological processes as plants to produce starch.
However, you might find starch in some canned tuna products. This is often added as a thickener or binder in the packing process.