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4 films
75% of a healthy diet should consist of fruits and vegetables, according to Ray Hill, a health food store owner in Stroud, England.
Dr Graham Phillips investigates evidence from ancient teeth to reveal dietary impacts on health.
Dental calculus, the hardened residue on teeth, serves as a unique fossil record that allows scientists to trace microbial evolution over 40 million years.
Antibiotics were invented to combat harmful bacteria but affect good bacteria too.
