The best replacement for proteins is carbohydrates.

The best alternatives to proteins are rated as following:
★★★★★  carbohydrates
★★★★  carbs
★★★  amino acids
★★  incomplete proteins
★★  dna
★★  nucleic acids
★  animal proteins
★  lipids
★  polypeptides
★  plant proteins
★  enzymes
★  peptides
★  fats
★  channel proteins
  genes
  peripheral proteins
  molecules
  carrier proteins
  animal based proteins
  transmembrane proteins
  bad proteins

Your alternative for proteins is not listed? Suggest!
Speaking about proteins, one probably shouldn't forget about ligands.

Other search terms related to proteins and their ratings are:
★★★★★ ligands
★★★★ carbohydrates
★★★ lead acetate
★ no carbs
★ attached carbohydrates
You have in mind a companion for proteins and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of proteins in all years. Click on graph for more.
proteins
carbohydrates
carbs