We genetically engineer the foods such as wheat, rice, soy, etc…so the food we eat is not the same as what was in the bible. Same name but not genetically the same. Monsanto was not in the bible.
Also, human genetics change over millenia; our genes reflect the foods we eat and whats in our environment. Each and every thing you put in your body effects your genes…compound this over thousands of years and it causes problems. Humans likely weren’t allergic to grains when they were mostly wild, but after years of living beside them and eating them as a main source of food…its bound to cause problems. Our diets aren’t balanced enough nowadays and in reality we should be eating low amounts of grains, sugar, etc. and high amounts of other foods such as vegetables.
Information about teff: