Processed foods such as chips and sweets are devoid of vital nutrients and can cause oxidative stress and vitamin deficiencies, which can cause hair to become grey before time.
Consuming too much sugar can weaken hair follicles, destroy collagen, and speed up ageing, which can result in grey hair.
Regular consumption of alcohol can decrease vital minerals that support hair colour maintenance, including zinc, copper and vitamin B.
High sodium intake can reduce blood flow to the scalp, and restrict nutrient absorption, speeding up the greying process.
Too much caffeine can hinder nutrient absorption, especially B vitamins and iron, and weaken hair follicles, which can cause premature greying of the hair.