'protein-packed' originates from the English word 'protein' combined with 'packed', where 'protein' refers to a macronutrient essential for body function and 'packed' means filled or loaded with.

'protein' comes from the Greek word 'proteios', meaning 'primary' or 'first', and 'packed' is derived from the Middle English 'pakken', meaning to fill or load.

Initially, 'packed' meant 'filled or loaded', and in combination with 'protein', it evolved to mean 'containing a high amount of protein'.