Heat or oxidation both are bad.
Oxidation is much worse than 10-15 degree change in the temperature of the produce being juiced.
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Oxidation makes the nutrition less.
'Up to 20% more juice', 'Up to three times more nutrition', 'Up to 30% less pulp...
Lower speed juicers produce better quality juice.
Juicer create heat so they will "Cook" the Juice.
Increase in temperature makes the juice harmful.