The amino acids phenylalanine and tyrosine appear to aggravate the disease, apparently due to a specific intermediary block in their metabolism. Findings from both animal and human studies have confirmed the efficacy of removing these amino acids from the diet.
Also, studies using an animal model of SLE have found that diets high in fat may promote the onset and progression of the disease by weakening immune responses, suggesting that a low fat diet could be beneficial.
In your case, it might be a good idea to consult with a nutritionist about the ingredients of the protein shake you want to take.
Cranberry juice does not affect lupus, in general, but no studies could be found to confirm this. So consulting with a specialist for systemic lupus erythematosus about your diet is recommended.
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