Probably not. There really shouldn't be any reason for a protein shake or a meal-replacement shake to make you lose your hair. However, you should get any potential allergies checked out. On a related topic, please be sure to look at fat and calorie content in any of these shakes. Some meal replacements may be adding more calories than you think. Good luck!
Possibly. There are many potential causes for hair loss including alteration in your vitamins, minerals, and doet.
No. Aware of no evidence that Slimfast or other liquid high protein shake products result in hair loss.