The theory that roast beef with potatoes is harmful is sheer nonsense. With the participation of gastric acid, protein contained in beef is preliminarily decomposed by pepsin in gastric juice to form chyme, which is easy to be absorbed by human body in small intestine. The main component of potato is starch, which requires less gastric acid concentration than meat. However, any food will change the acidity of gastric acid when it is digested. Because all kinds of foods are constantly mixed in the stomach and decomposed with the participation of gastric acid, as long as the acidity decreases, gastric acid will be secreted again, instead of secreting the corresponding concentration of gastric acid according to the digestive difficulty of each food to participate in digestion.

Experts pointed out that "different gastric acid concentrations required for digestion will prolong the residence time of food in the stomach", which leads to gastrointestinal dysfunction, and even leads to the conclusion that roast beef with potatoes is "toxic". If we follow this logic, then all foods can't be eaten together in the future, and we can only eat one before eating others, which is obviously absurd.

If you insist that this thing is poisonous, you can eat less.