Serious help needed for my knee pain (joint pain)?

Yeah,

I heard, 1. when you have knee joint pain, you are not allowed to have acidic stuff like lemon, orange etc? is this true??

2. Secondly, coz im a soccerplayer, before playing soccer, should i WARM UP first? maybe i thought if i warm up first, then then will prepare my knees therefore not as much pain? coz quite often i play without warming up, and my fitness is not the problem, its my knees, so maybe i have to warm up first?

3. Any foods/nutrition to take/avoid for my knee?

Thanks thanks

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Tags: fitness, knee joint pain, knees, nutrition, orange, playing soccer, soccerplayer