Switching to a plant-based lifestyle is no longer a niche choice — it’s a global shift driven by health, environment, and ethics. But the central question remains: Can you actually get everything your body needs from plants alone?
The short answer from the Academy of Nutrition and Dietetics in its updated 2025 position paper is yes.
The academy affirms that appropriately planned vegan diets are nutritionally adequate for adults — though they exclude children and pregnant or lactating individuals from this guidance — and offer long-term benefits for cardiometabolic health.
The non-negotiable vitamin
If there is one rule in vegan nutrition, it’s that you cannot ignore vitamin B12. This nutrient is essential for maintaining a healthy nervous system and producing red blood cells.
A deficiency doesn’t show up overnight because the liver can store B12 for years. However, once those stores are depleted, the result can be irreversible nerve damage and profound fatigue.
Unlike most other vitamins, B12 is not naturally occurring in plant foods. In nature, B12 is produced by bacteria found in soil and water; because we modern humans wash our produce and treat our water, those natural sources are gone.
While grazing animals get B12 from the earth, vegans must cut out the middleman. The B12 found in fortified foods and supplements is produced through bacterial fermentation, making it entirely animal-free.
To stay safe, you have three reliable options: Consume fortified foods like nutritional yeast two to three times a day, take a daily supplement of at least 10 micrograms (mcg), or take a high-dose weekly supplement of 2,000 mcg.
Bridging the iron gap
Iron is another area where the source matters as much as the amount. Plants provide non-heme iron, which the body does not absorb as easily as the heme iron found in meat. Because of this lower bioavailability, vegans may actually need significantly more iron than meat-eaters to maintain healthy levels.
The secret to making plant-based iron work is vitamin C. Pairing iron-rich foods like lentils, beans, or spinach with a squeeze of lemon or a side of bell peppers can triple your absorption rates.
On the flip side, you should avoid drinking tea or coffee with your meals, as the tannins in these drinks can block iron from entering your system.
Protecting your bones and heart
As we age, bone density becomes a primary concern. Calcium is often associated with dairy, but you can find it in kale, bok choy, and calcium-enriched tofu. However, calcium doesn’t work alone. It requires vitamin D to be absorbed effectively.
Since vitamin D is primarily produced through sunlight, many people — regardless of their diet — are deficient during the winter months. For vegans, finding highly absorbable vitamin D3 in food is historically difficult. While UV-treated mushrooms offer some benefits, most fortified cereals rely on the less effective D2 form.
Fortunately, lichen-derived vegan D3 supplements are now widely available. Most experts suggest a daily target of 1,000 to 2,000 international units (IUs) to maintain optimal bone density.
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The truth about plant protein
You may have heard that plant proteins are incomplete, but this is a well-debunked myth. As long as you eat a variety of whole grains, legumes, and nuts, your body will assemble the necessary amino acids.
The real challenge for mature adults is the total volume required. Because plant proteins have lower digestibility compared to animal sources, emerging research suggests older vegans should aim for 1.3 to 1.5 grams (g) of protein per kilogram of body weight to prevent muscle loss.
For a 150-pound person, that translates to roughly 90 g to 100 g of protein daily. While achievable with tofu, lentils, and tempeh, hitting that target requires conscious meal planning.
Follow the evidence
Recent studies from 2024 highlight a more nuanced picture of plant-based health. While vegans consistently show lower risks of heart disease and Type 2 diabetes, long-term data indicates a higher risk for bone fractures when the diet lacks sufficient calcium, vitamin D, and protein.
The takeaway isn’t that plants are the problem, but rather the quality of the food. A diet of highly processed meat alternatives doesn’t offer the same protection as one built on whole plants. In fact, modeling studies demonstrate that shifting from a standard Western diet to a whole-food vegan diet at age 40 can increase life expectancy by five to nine years.
The transition to a vegan diet isn’t an all-or-nothing game. If you’re looking to start, focus on adding one nutrient-dense plant meal a day rather than overhauling your entire kitchen at once.
Consider scheduling an annual blood test to monitor your B12, vitamin D, and iron levels. This data-driven approach ensures you enjoy the benefits of a plant-based life without the hidden costs of deficiency.
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