fad syndrome
When you get so obsessed with a trend that you think it's a real sickness and start telling everyone about it like it's life or death.
He told me he has 'alkaline diet' and now he only eats green apples and lemon water.
My cousin thinks she has 'detox juice' syndrome and now she drinks 6 juices a day.
He stopped eating meat and now he calls himself 'the carnivore' because he only eats meat.