Final answer:
The best professional to consult for nutritional information and advice on healthy eating and weight loss is a registered dietitian, who can create personalized nutrition plans based on individual health needs.
Step-by-step explanation:
If your friend is seeking professional advice on healthy eating and weight loss, the best professional to consult for nutritional information is a registered dietitian. Registered dietitians specialize in creating tailored nutrition programs to help individuals achieve their health goals, including weight management. They have the educational background and clinical experience to assess individual needs and devise personalized diet plans that consider specific health conditions, such as diabetes, and the proper balance of nutrients required for optimal health. Before making decisions on diet investments or lifestyle changes, it is important to review the scientific evidence supporting any program, consider any potential consequences, and consult with a dietitian or healthcare professional.