He spoke with Express.co.uk about vitamin D.
“The Government recommendation is for people to supplement during the winter months,” he said. “I mostly agree with that.
“Certainly if you have a darker complexion like myself you know you’d probably want to supplement all year round.
“There are a few experts who disagree with the advice, but I think it’s pretty innocuous.
“You might as well take a supplement because there is a plausible mechanism by which that can improve mood.”
Supplements can boost health when the diet is not enough. Another nutritionist, Rosie Miller, told Express.co.uk the best vitamins and supplements to take during autumn and winter.
READ MORE: Vitamin D: Signs you’ve taken too many vitamin D supplements – ‘harmful’ effects to spot