By Zahra Khaliq Some of our favourite foods may no longer exist within 100 years – includingchocolate, avocados and seafood – new research has found. Food futurologists have put this down to us becoming much more health-concious, and shifting our focus on sustainabilty and ethics. More than 1 in 7 Brits believe all meals will be plant-based by 2123, with many pointing to the negative environmental impact of eating animal products, research by LNER has found. And while 59% of Brits say they can’t imagine their lives without chocolate, Food Futurologist, Robin Fegen, says the much-loved treat co…