what is the minimum amount of calories that I need a day?

Think of it this way if you need 1,500 calories a day you are fine. If you suddenly drop that to 1,000 a day your body will assume that you have less food available and adjust your metabolic rate so that you need closer to 1,000 to survive and stop losing the precious stores that keep you alive for these scenarios.
Effectively, a healthy weight loss comes from a slightly lower caloric consumption combined with well thought out and planned exercise routine.

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