When does your body go into starvation mode?

For me I find I lose weight when I reduce my calories by 5 - 25% but if I reduce them by 50% or 60% I go into starvation mode
5-10% calorie reduction
Vote A
15 - 20% calorie reduction
Vote B
30 - 35% calorie reduction
Vote C
40 - 60% calorie reduction
Vote D
70 - 80% calorie reductio n
Vote E
90 - 100% calorie reduction
Vote F
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When does your body go into starvation mode?
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