Food Tracking for Vegetarians and Vegans: What to Watch Beyond Calories

Vegetarian and vegan diets are associated with plenty of health benefits, and major dietetic organisations consider well-planned plant-based diets suitable for every stage of life. The key words are “well planned”. A few nutrients come mainly or more easily from animal foods, and those are the ones a food diary helps you check.

The nutrients to plan for

Nutrient	Why it needs attention	Plant-based sources
Vitamin B12	Occurs naturally almost only in animal foods	Fortified plant milks, cereals and nutritional yeast; supplements
Iron	Plant (non-heme) iron is absorbed less well	Beans, lentils, tofu, fortified cereals, leafy greens, seeds
Calcium	Dairy is the main source for many people	Calcium-set tofu, fortified plant milks, leafy greens, almonds
Vitamin D	Few foods contain it	Fortified foods, UV-exposed mushrooms; sunlight; supplements
Zinc	Absorption is lower from plant foods	Beans, nuts, seeds, whole grains, tofu
Iodine	Main sources are dairy and seafood	Iodised salt, some seaweeds (amounts vary widely), supplements
Omega-3 fats	EPA and DHA come mainly from fish	Flax, chia, walnuts (ALA); algae-based supplements (EPA and DHA)
Protein	Needs a little more planning	Beans, lentils, tofu, tempeh, soy milk, seitan, nuts, seeds

Iron and vitamin C

Because plant iron is absorbed less well, US guidance suggests vegetarians may need up to 1.8 times the usual recommended intake. Two simple habits help: eat a vitamin C source, such as peppers, citrus, tomatoes or broccoli, with iron-rich meals, and keep tea and coffee for between meals rather than with them.

Protein without fuss

You do not need to combine proteins at every meal. Eating a variety of plant proteins across the day supplies all the essential amino acids. If you train hard or are trying to keep muscle while losing weight, include a protein-rich food at each meal: tofu at breakfast, lentil soup at lunch, beans or tempeh at dinner.

Using a tracker well on a plant-based diet

1. Track for two weeks and look at B12, iron, calcium, vitamin D and protein specifically.
2. Check fortified products by label. Fortification varies by brand and country, so generic entries can be wrong. Scan the barcode or enter the label.
3. Watch for blanks. Many user-entered foods leave micronutrients empty, which shows as zero.
4. Log supplements if your app allows it, so the totals reflect what you take.
5. Look at weekly averages, and talk to a doctor or registered dietitian before adding supplements other than B12.

The bottom line

A plant-based diet can provide everything you need. Make B12 non-negotiable, plan iron, calcium, vitamin D, iodine and omega-3s, include protein at each meal, and use a couple of weeks of tracking to check that the plan works for you.