Not a diagnosis. NutriGap only flags possible nutrient gaps from the answers you give. It cannot diagnose a deficiency, and it cannot replace a clinician or a blood test. If you are worried about your health, speak to a clinician promptly.

NutriGap: Free Diet & Vitamin Deficiency Checker — Keto, Vegan & Paleo

Check possible diet and vitamin gaps for standard, vegan, vegetarian, keto, paleo and intermittent fasting diets — with food-first fixes and the blood test to ask a clinician about.

Step 1 of 5

Step 0 — Urgent symptoms check

If you have any of these right now, seek urgent care immediately instead of using the checker result:

Chest pain or pressure Difficulty breathing Fainting or collapse Severe or uncontrolled bleeding Sudden severe headache Stroke signs: face drooping, arm weakness, or speech difficulty Severe abdominal pain Coughing up or vomiting blood

Seek urgent care now. Do not wait for a nutrient result. Call your local emergency number or go to urgent care / emergency services immediately, and tell them about the symptom you checked.

1. Your diet and lifestyle

Diet typeStandard / BalancedVegan (Plant Based)VegetarianKeto / Low CarbPaleo / Whole30Intermittent FastingAge (years)SexPrefer not to sayFemaleMaleLife stageAdultTeenOlder adult (65+)PregnantBreastfeedingSun exposureDailyA few times a weekRarelyAlmost neverHow long have you followed this diet?Less than 1 month1 to 6 months6 to 12 monthsMore than 1 year

2. Symptoms (select all that apply)

Chronic fatigue Muscle cramps Brain fog / dizziness Brittle nails or hair Irritability / mood changes Pale skin Hair loss or thinning Tingling hands or feet Restless legs Slow wound healing Bone pain Bleeding gums Dry skin or scalp Frequent illnessSymptom severityMildModerateSevereHow long have symptoms lasted?Less than 2 weeks2 to 8 weeksMore than 2 months

3. Foods you eat regularly (be honest)

Dairy / milk Red meat Eggs Fish Legumes (beans, lentils, chickpeas) Nuts Fortified foods (fortified milk, cereals, or plant drinks) Nutritional yeast Leafy greens Whole grains Fruit Vegetables Electrolytes (salt / avocado)

4. Supplements and blood-test history

Supplements already taken:

None Multivitamin Vitamin B12 Vitamin D Iron Calcium Omega-3 MagnesiumBlood-test historyNever testedTested in the last year — normalTested in the last year — low resultTested more than a year agoNot sure

About calories and macros: This checker does not estimate calories or macros. It does not ask for height, weight, or activity level, so it cannot calculate your daily calorie or macro needs. Use it only for possible nutrient gaps, not for calorie planning.

How to Use

1. First complete the urgent symptoms check. If any urgent symptom is checked, seek urgent care and do not rely on a nutrient result.
2. Choose your diet, age, sex, life stage, sun exposure, and how long you have followed the diet.
3. Select your symptoms, their severity and duration, the foods you eat regularly, supplements you already take, and your blood-test history.
4. Click “Check Possible Gaps” to see per-nutrient possible gaps, food-first fixes, and the blood test to ask a clinician about.
5. Take the result to a clinician if symptoms are severe, long-lasting, or you have a previous low blood-test result.

Frequently Asked Questions

Can a checker diagnose a deficiency?

No. A checker can only flag possible gaps from your answers. Only a clinician, together with your history and a blood test where appropriate, can diagnose a deficiency. Treat this result as a starting point for a conversation, not a diagnosis.

What are the most common vegan deficiencies?

Vitamin B12, vitamin D, iron, iodine, omega-3, zinc, calcium, and protein are the nutrients most often at risk on a vegan diet, because their main sources are animal foods or sun exposure. Fortified foods and, for B12 in particular, a supplement discussed with a clinician are the reliable routes — eating a varied plant-based diet alone does not guarantee B12.

Which nutrients are low on keto?

Keto diets commonly run low on electrolytes (sodium, potassium, magnesium), fibre, vitamin C, folate, and sometimes calcium, because fruit, grains, and many starchy vegetables are limited. Muscle cramps, dizziness, and fatigue on keto are often linked to electrolyte and fluid shifts, but persistent symptoms still need a clinician review.

Should vegans take B12?

Yes, in practice: vitamin B12 is not reliably obtained from an unsupplemented plant-based diet. Vegans should get B12 from fortified foods eaten regularly or from a B12 supplement, and discuss the form and amount with a clinician or dietitian. Do not rely on seaweed, mushrooms, or unfortified plant foods for B12.

When should I get a blood test?

Ask a clinician about a blood test if symptoms are severe or last more than a few weeks, if you follow a restrictive diet for a long time, if you are pregnant, breastfeeding, or an older adult, or if a previous test showed a low result. Urgent symptoms should go to urgent care first, not to a routine blood test.

What causes fatigue on keto?

Fatigue on keto can come from electrolyte and fluid shifts in the early weeks, eating too little overall, poor sleep, or gaps such as iron or B12. Because this checker does not estimate calories, it cannot tell whether you are under-eating. If fatigue is severe, persistent, or comes with dizziness, pale skin, or tingling, see a clinician promptly.