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Diet myths

Five short checks with sources. No health promises. No ranking of eating patterns.

Back to the diet matrix

Protein combining

Do you need to combine proteins in the same meal?

Fixed example for search engines. Each myth has a source and a retrieved date.

These notes describe common claims and published references. They are not medical advice and do not rank diets.

  1. 1 Do you need to combine proteins in the same meal?

    Classic advice said to pair beans and grains at every meal. Current position statements say a varied plant diet over the day covers essential amino acids for most healthy people. This is labeling of intake patterns, not medical advice.

    Amino acids across the day, not only in one plate

    Academy of Nutrition and Dietetics position on vegetarian diets (Melina et al.); WHO protein quality discussion. As of September 1, 2026.

  2. 2 Are plant proteins always incomplete?

    Many single plant foods are lower in one amino acid than a reference pattern. Soy, quinoa, and others are closer to complete. Variety across meals usually fills gaps. Numbers come from food composition data, not from a ranking of diets.

    Example plant protein sources side by side

    USDA FoodData Central amino acid patterns; AND vegetarian position. As of September 1, 2026.

  3. 3 Is milk the only practical calcium source?

    Dairy is one dense source. Fortified plant drinks, tofu set with calcium, and some leafy greens also contribute. Needs and absorption differ by person. This tool lists sources, it does not prescribe an amount.

    Calcium appears in more than one food group

    USDA FoodData Central; EFSA and NIH calcium fact sheets. As of September 1, 2026.

  4. 4 Do vegetarians eat fish?

    In standard vegetarian labels, fish is excluded. People who eat fish but not meat are usually called pescatarian. Menus sometimes mix the words. Check the matrix row, not the marketing line alone.

    Vegetarian vs pescatarian on the fish column

    IVU / AND vegetarian terminology; common menu labeling practice. As of September 1, 2026.

  5. 5 Does plant-based mean the same as vegan?

    Not always. Vegan has a clearer social definition for animal foods. Plant-based can mean mostly plants or fully plant. Ask for dairy, eggs, honey, and gelatin when it matters.

    A spectrum of how the terms are used

    Labeling and menu language surveys; Vegan Society vs plant-forward marketing. As of September 1, 2026.