Why ?

[Helics]

why foods are stored in body as glycogen form in animals? why it can not stored as amino acids or fatty acid or trigleceride?

[Darby]

They are stored that way - only glucose is stored as glycogen. Whether amino acids get "stored" depends upon how your define the term, and lipids are definitely stored.

[JackBean]

Glycogen is the fastest source of energy, but for sure not the main source of energy.

[mavis]

amino acids cannot be stored as the nitrogen is toxic.They must be deaminated and excreted as urea.

Glycogen and triglyceride are storage of energy.

[Darby]

What you just said about amino acids makes no sense - it's like saying water can't be stored because hydrogen is explosive. Amino acids can be sequestered in proteins - whether that is true storage or not is debatable. If you USE amino acids for respiration-derived energy, then you have to deal with freed ammonia. But they aren't always used, at least not immediately.

[JackBean]

That was probably manis's point that they cannot be used as immediate source of energy