SERGIO AGUERO has revealed the secret to his amazing goalscoring ability – ditching BBQ food. The Argentina ace is Manchester City’s all-time top marksman with 254 goals in 368 games. But banging in goals hasn’t always been a piece of cake for the 31-year-old striker – who was left feeling DIZZY on the pitch after regularly gorging on barbecues and steaks from 2013 to 2016. Aguero arrived at the Etihad from Atletico Madrid for £38million nine years ago and has revealed that he struggled with his diet and weight for three years in Manchester. The City ace piled on the pounds due to eating a beef-rich diet – a staple food for many Argentinians. But since ditching his old diet for chicken and rice, the striker is 1.5 kgs lighter and feeling like a new man.He told TyC Sports: “I think it was from 2013 to 2016 that I could not adapt to food well, “From there I met an Italian doctor online – and he changed my mind a little. “I told him what I usually ate, which was to eat a lot of meat, and when he told me to try it just once a week I was…