If you are taking whey protein diet supplements then it is important to consume large amount of water. Another possible side effect is irritable bowel syndrome under which the patientAlpha Shred may experience sudden urge to have bowel movement. You may even feel dull headache in the beginning that may lead to stomach cramps at a later stage. Whey protein should be used as a dietary supplement only and it should not replace your regular diet. There are chances that the first time users may feel shrinkage of their appetite. However, it is important to continue regular meals and snacks in between. Keep in mind that it is a body supplement and it is better to get as much as protein in your body as possible through your regular diet. Whey protein side effects start appearing if it is consumed in large quantities. It is important to read the label for dosage and confirm it with your nutritionist. Some people think that double dosage will lead to enhanced results. They are unaware of the fact that whey protein contains high level of lactose, which takes time in being consumed by the body. Some of the common symptoms include dizziness and patient may feel nauseated.