If you are living in Japan, you are eating Japanese food. Therefore, you are ingesting higher then normal amounts of radioactive particles. You will be slowly shedding some of those internally contaminated particles over the years. There has also been complaints of workers getting internal contamination while working at the plant and they could not determine the source. We know that normal Japanese citizens are getting internal contamination because it has been metered in their defecation’s.
‘Higher than normal’ meaning what? You can ingest higher than normal levels of anything of a bad nature, and still do so safely.
Have you ever had Ben & Jerry’s ice cream?