She added: “For any actor taking a role like this, it is completely important that you see her head and we see her shaving it - it was just always a no-brainer.
“You have the honour of doing something to yourself that is totally in support of the character.”
Pugh’s head was shaved onscreen by her co-star, Andrew Garfield, who admitted it was a nerve-wracking experience.
He told the magazine: “It was a privilege to be given that job. [But] What if I somehow destroyed the head of one of the best actors of her generation? It was terrifying, but ultimately it was a very beautiful, intimate scene to shoot and thank God she has such a nicely shaped melon.”
In the interview, Pugh also opened up about facing criticism about her appearance from online trolls, admitting: “It’s so hard. [The internet’s] a very mean place. It’s really painful to read people being nasty about my confidence or nasty about my weight. It never feels good.
“The one thing I always wanted to achieve was to never sell someone else something that isn’t the real me.”