Thank you for the interesting replies Budi and SnowWhite, it really felt like I got some perspective.
Personal nutrition is very individual. You need to experiment a little and know how your body reacts. Common sense helps a lot as well. I only use unflavoured whey powder and take it only a certain times rather than making it a part of the routine.
Thanks for the reminding of these tips. I have thick blood and the doctor told me to drink more water, but I just forget about it. I'm going to drink some water now