Only 6 cases (3 for MSG, 3 for lupin) are reported, which is insufficient for drawing generalizable conclusions about prevalence, incidence, or direct causal links to the broader population. This is a case report series, not a large-scale clinical study.
Observational and Case Report Design
The study is descriptive, relying on observed cases rather than controlled experiments. This design can only establish associations and cannot definitively prove causation between food consumption and symptoms.
Information regarding food intake amounts, symptom onset, and duration was self-reported by patients, which is susceptible to recall bias and potential inaccuracies.
Without a comparison group, it is challenging to isolate the effects of the food items from other potential factors or to determine the background incidence of these symptoms.
Unspecified Lupin Seed Details
For the lupin cases, critical details such as the exact lupin species, origin, and specific preparation methods (especially debittering, which affects alkaloid content) were often unknown, making it difficult to pinpoint the exact toxic exposure.