Lasagna or Grilled Cheese Sandwich Protein-starch combos inhibit salivary digestion of starch. Protein and starches need different enzymes and different levels of acidity to be digested. When eaten together, your body is forced to make a choice to digest protein but not starches. According to Dr Herbert Shelton, the champion of original Natural hygiene ideas, undigested starchy food undergoes fermentation and decomposition and overtime leads to poisonous end-products. Supposedly, adding greens to hard-to-digest cheesy dishes makes them easier for the stomach. Arugula salad, please!