That’s a tricky question and depends on many things. Proteins are made up of amino acids which are used by the body to build and repair tissues. High protein diets may help people lose weight and build muscle but they have a downside. They lead to more plaque buildup in the arteries and it is the unstable kind which is more prone to rupturing and causing a blockage. People who eat a more plant-centered diet tend to have a lower protein intake. This may not be bad because by eating fewer animal foods they also get fewer sulfur amino acids, such as methionine and cysteine, which lowers the risk for heart disease.
Bottom line: We need protein but we don’t need a great deal of it everyday. The healthiest eating plan would be a mixture of both animal and plant protein sources