Shake does not automatically mean meal replacement
Use the category and directions printed on the exact product. A protein shake may be designed to supplement food rather than replace a meal. Do not turn it into a meal replacement because an online recipe calls it one. If the pack is labelled as a meal replacement, follow its intended use and check how the prepared portion fits into the rest of your day.
Compare the prepared serving
Compare like with like: dry powder with dry powder, or prepared drink with prepared drink using the same liquid. Check both the serving column and the per-100-g or per-100-ml column. A larger scoop can make a product look higher in protein simply because the serving is larger. Write down preparation, serving size and the figures relevant to you before deciding.
Build around a real day
Write down when you eat, where preparation is possible and what equipment is available. Choose one practical change, then review taste, convenience and cost after trying it. Keep ordinary foods and variety in the picture. A convenient format is useful only if it suits your circumstances; it does not guarantee a health or weight outcome.
Check every ingredient you add
Read the product’s allergen declaration and any precautionary statement. Check your chosen milk, plant drink, topping and shared equipment too. Vegan, dairy-free and lactose-free describe different things; do not treat them as equivalent. With an allergy, do not rely on a flavour name or a photograph. Ask the seller for the current label if it is not clearly available.
Sources & further reading
General information, not personalised medical advice. Always follow the label supplied with your product. Ask a qualified health professional about suitability, especially with medicines, pregnancy or an existing condition.