Change goals but keep previous entries

Hello,

On my fat loss journey I want to decrease the amounts of kcal I consume gradually. However, when I change the goals in the Settings, the previous diary entries are also changed to reflect the new goal. This means that instead of being around 95-100% of my daily goals, my previous entries suddenly go to 110%+.

How can I change my goal but keep my previous diary entries on the previous goal?