What are some (possibly unhealthy), but very fast ways to lose weight?

So far i have lemon with water in the morning, a lot of water and tea, laxatives, whey in water, egg whites, leafy greens, apple cider vinegar, spices, lots of long distance cardio
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this is for a research project im doing!!! not for me to do!
What are some (possibly unhealthy), but very fast ways to lose weight?
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