Which one of the following is considered as the easily digestible source of protein?

Soybean is widely recognized as the most easily digestible source of protein among the given options, particularly when compared to complex animal proteins. While egg albumin has the highest biological value (BV) and is used as a standard for protein quality [t1], plant-based proteins like soybean are often highlighted for their digestibility in various dietary contexts [c2]. Soybean contains high-quality protein with a Protein Digestibility Corrected Amino Acid Score (PDCAAS) close to 1.0, making it comparable to animal proteins but often easier for the human digestive system to process than red meat or dense fish fibers [t5]. Red meat is generally more difficult to digest due to its complex connective tissues and fat content [c1]. Although animal proteins are highly bioavailable [t3], soybean is specifically noted as a major, efficient, and digestible protein source in many nutritional guidelines [c2][c5].

Sources

1. [1] https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/egg-protein
2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 25: Agriculture > Pulses or Grain Legumes > p. 353
3. [3] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.3 > p. 86
4. [4] https://pmc.ncbi.nlm.nih.gov/articles/PMC11171741/
5. [5] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 26: Agriculture > 3. FRUITS > p. 260