10 Apr 2018 --- Zinc nanoparticles that are present in tinned foods may negatively affect how the digestive tract operates, as they are absorbed into the bloodstream, a study has found. Researchers at Binghamton University, State University at New York, found that the nanoparticles may decrease nutrient absorption in digestion, as well as bump up the levels of zinc in the food itself to 100 times the daily allowance. The long-term effect on human health is unknown and is something that warrants future research, the researchers state.