Animal proteins like beef and eggs contain higher amounts of leucine and other essential amino acids your body can't make. Plant proteins have these amino acids too, but in lower concentrations per serving, which matters if you're trying to build muscle.
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Essential amino acids are the amino acids, which are the building blocks to protein that we need for muscle synthesis. They are the ones that our body can't make, so we have to get them from the outside. That's why they're essential. And then we want to get the biggest bang for our buck. So what type of protein is going to provide us the most protein per calorie? Animal proteins typically contain a higher proportion of these essential amino acids. Like protein from beef, eggs, chicken, and fish, all of these contain the essential amino acids in the right ratios and in a more concentrated, easier to use form. These protein sources also deliver more leucine. Leucine is an amino acid that acts like a light switch to building more muscle. Animal protein gives you more leucine per bite than most plant proteins.