What is the least amount of body fat one can have?

I mean, what is the least amount that they can still be healthy and energetic. I am on a journey to eat PURELY healthy (like no no fat at all) foods. I am also about to being hardcore training. What percentage of body fat is the healthiest/leanest i can be at? 6% 5% 7%?

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what is the best body fat caliper for the least amount of money?

I need a body fat caliper but i dont want to spend a couple hundred bucks for it. I need a good one also, not a POS. thanks!
ok thanks for giving me diet tips however, i dont need them. i just need some advice on what body fat calipers are worth the money. A BF caliper is an instrument used to measure the percentage of body fat one has. Thank you for your help!

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