Digestive Issues
Some people experience severe digestive issues following consumption of whey protein powder. These may include gas, bloating, cramps, tiredness, weakness, fatigue, headaches, and irritability. One of the possible causes is lactose intolerance after they ingest whey concentrate. Undigested protein in the colon will undergo bacterial fermentation which leads to the production of, among other things, gas and fatty acids.
Similar symptoms can be caused by ingredients found in lower quality protein powders such as lactose in whey protein concentrate or artificial sweeteners in most commercial protein powders. The effects of these substances can be distinguished from the effects of whey alone by switching to an unsweetened whey isolate or hydrolysate. If symptoms are not eliminated by switching to a purer form of whey protein, using alternative protein sources such as pea protein or rice protein may reduce symptoms.
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