For a Safe and Comfortable Vegetarian Life: Know the Nutrients Often Lacking in Plant-Based Diets!

To Continue a Safe and Comfortable Vegetarian Life — Introduction

Vegetarianism (vegetarian, vegan, macrobiotic, etc.) offers many benefits in terms of environment, health, and beauty. We at geefee team often hear voices saying that their physical condition has improved with a plant-based diet. However, it is also true that nutrients abundant in animal products cannot always be sufficiently covered by plants alone. This time, we have compiled a clear and practical summary of "which nutrients are easily deficient" and "how to supplement them." We will share our actual attempts, including successes and failures.

Nutrients to Pay Special Attention to in a Vegetarian Diet

Vitamin B12 — The Most Important Point

Vitamin B12 is essential for red blood cell production and nerve function, and is almost non-existent in plant-based foods. While some seaweeds and spirulina may contain B12-like substances, they are not always physiologically active B12, and their reliability is considered low. Nutritional guidelines also recommend regular B12 supplementation (fortified foods or supplements) for vegans. We, too, were recommended by a vegan friend to first incorporate fortified plant-based milk and a weekly B12 supplement, and we noticed an improvement in our fatigue levels.

Long-Chain Omega-3s (EPA・DHA)

Alpha-linolenic acid (ALA) found in plants is converted to EPA and DHA in the body, but the conversion efficiency is low. If you are concerned about brain and cardiovascular health, algae-derived DHA/EPA supplements are an effective plant-based option. The algae-derived oil we tried had no fishy smell and was easy to continue.

Iron・Zinc・Calcium — Beware of Differences in Absorption Rates

While plant-based foods contain iron, zinc, and calcium, the problem is that most of it is non-heme iron, which has a low absorption rate. Taking vitamin C together can increase iron absorption, so adding lemons or bell peppers is an effective trick. Although whole grains and nuts are rich in zinc, phytic acid (a component of grains and beans) inhibits absorption, so pretreatment such as soaking, sprouting, and fermentation (e.g., tempeh, miso) is recommended. Calcium can be supplemented with fortified plant-based milk, tofu, and komatsuna (Japanese mustard spinach), but be aware that spinach is high in oxalic acid, which hinders absorption.

Creatine・Carnosine — Ingredients for Exercisers to Be Mindful Of

Creatine is a component mainly found in meat, and it helps supply immediate energy for muscle contraction. Although it can be synthesized in the liver, vegetarians tend to have lower body stores, and supplementation may be effective for those who engage in strength training or short-duration high-intensity exercise (generally 3-5g/day is commonly used in the sports field). Carnosine is a dipeptide abundant in meat, and it is synthesized in the body from β-alanine and histidine. Some research suggests that using β-alanine supplements can increase muscle carnosine levels, potentially reducing fatigue and improving exercise performance. However, intake varies individually, and if you are new to it, we recommend consulting a doctor or sports nutritionist.

Vitamin D・Iodine・Protein Quality

Vitamin D is synthesized by sunlight, but it tends to be deficient due to insufficient sunlight or indoor-centric lifestyles, and plant-based vitamin D3 is limited. Recently, vegan D3 supplements derived from lichen have become available. Iodine can be obtained from seaweed, but the amount needs to be carefully monitored as some types can be too high. Protein itself is sufficient if you combine soybeans, legumes, and grains, but those with high exercise levels or in growth phases should be mindful of total intake and the balance of essential amino acids.

Tips for Supplements and Food Choices

• First, get a blood test to understand your current status (B12, iron, vitamin D, etc.).
• Choose manufacturers with reliable ingredient labels and third-party testing. Be wary of overly cheap products.
• For B12, take regularly (small amounts daily or a larger amount weekly); for DHA/EPA, choose algae-derived; for D3, lichen-derived, etc., plant-based alternatives are available.
• Effectively utilize fortified foods (fortified cereals, plant-based milk, nutritional yeast, etc.).
• Supplements are "aids," so prioritize dietary improvements first (fermentation, soaking, co-ingestion of vitamin C).

Specific Points for People with Exercise Habits

For those who prioritize muscle training and athletic performance, creatine supplementation is said to be particularly effective for vegetarians. β-alanine (carnosine precursor) is also effective for short-duration high-intensity exercise. However, when introducing supplements, start with a small amount and observe its effects on sleep and digestion. Ensuring nutrient timing (protein and carbohydrates before and after exercise) and total energy intake is also important. In our experience, combining B12 and creatine during periods of increased exercise intensity seemed to accelerate fatigue recovery, but individual differences are significant, so consulting a specialist is reassuring.

Summary

While a plant-based diet offers many advantages, several nutrients require attention, including Vitamin B12, long-chain omega-3s (EPA/DHA), iron and zinc absorption, Vitamin D, creatine, and carnosine. Most deficiencies can be supplemented through fortified foods, fermentation and cooking techniques, and reliable supplements. The key is "informed choices" and "regular checks." We, too, feel that finding the right balance through trial and error is paramount. If you continue with a vegetarian diet, prepare nutritionally to live a safe and comfortable life.

Disclaimer: The information in this article is for general informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional before making any health-related decisions.