The most likely sources of reliable nutrition information from the options provided are:
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a registered dietitian nutritionist (RDN): RDNs are trained professionals with expertise in nutrition and dietetics, making them credible sources of information.
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a peer-reviewed scientific journal: Research published in peer-reviewed journals undergoes rigorous evaluation by experts in the field, ensuring the credibility and quality of the information.
The other options are generally less reliable due to varying levels of training and expertise:
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a supplement website: These may promote specific products for profit and may not always provide unbiased information.
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a personal trainer: While they may have some knowledge about nutrition, their expertise primarily lies in fitness, and they typically do not have the extensive training in nutrition that RDNs have.
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a nutritionist at a health food store: The title "nutritionist" is not regulated in many places, so their qualifications can vary widely. It's important to verify their credentials.
So, the reliable sources are the RDN and the peer-reviewed scientific journal.