Insane ram usage

(for context i have 16gb of ram) When i load Minecraft, ram usage goes to its usual 1-2gb. But when i load any worlds this keeps increasing at a rate of about 100mb per second without decreasing. Once this number reaches about 10gb my whole computer starts to lag badly, but the ram usage keeps increasing. It increases so high and fast that my game becomes unplayable. Also, when i exit the game, the ram usage stays about 10gb and i have to force end task in task manager. I have tried turning of vibrant visuals, lowering all my video settings to the minimum but nothing is working. I have attached a screenshot of my ram usage when playing a superflat world. I never had this problem before the update and my game would always run smoothly.