FennelMenu
8 conditions. One tracker.
Select the conditions that apply to you. Fennel checks every food against all of them simultaneously, showing verdicts, nutrient values, and budget impact in a single lookup.
What each condition tracks
| Condition | Fennel tracks | Typical limit |
|---|---|---|
| Kidney Stones | Oxalate | 100 mg/day |
| Gout | Purines | < 400 mg/day |
| CKD Stage 3 | Potassium + Phosphorus | Clinician-set |
| CKD Stage 5 | Potassium + Phosphorus | Strict, clinician-set |
| Coeliac Disease | Gluten | Zero tolerance |
| Lactose Intolerance | Lactose | Varies by person |
| IBS / Low FODMAP | FODMAP triggers | Elimination phase |
| Type 2 Diabetes | Glycaemic load | Clinician-set |
Combining conditions? Fennel checks them all at once.
Kidney stones + CKD Stage 3 tracks oxalate, potassium, and phosphorus together. Every food verdict covers all three limits in a single lookup.
Informational only. Default limits are illustrative. Your clinician or registered dietitian sets your actual targets based on your test results and medical history.
Kidney Stones
Oxalate · mg/dayOxalate (mg): the primary dietary driver of calcium oxalate stone formation
About 80% of kidney stones are calcium oxalate. Dietary oxalate is absorbed and excreted in urine; high concentrations promote crystal formation. Personal daily limits (typically 50 to 100 mg) are set by a clinician based on 24-hour urine results.
Clinical note
Calcium consumed with meals binds oxalate in the gut before it is absorbed, which actually reduces stone risk. Never restrict calcium without guidance.
Commonly flagged
- Spinach (970 mg/100g)
- Almonds (460 mg/100g)
- Rhubarb (860 mg/100g)
- Beet greens (675 mg/100g)
Example Fennel checks
291 mg oxalate
2.9× your daily limit
Verdict shown for default limits. Scales to your actual daily budget.
Gout
Purines · mg/dayPurines (mg): metabolise to uric acid and crystallise in joints
Purines break down into uric acid. When uric acid exceeds its solubility threshold, crystals deposit in joints, causing sudden, severe attacks. Animal-source purines raise uric acid significantly more than equivalent plant sources.
Clinical note
Fructose (in sugary drinks and juice) also raises uric acid independently of purines. Adequate hydration and low-fat dairy intake have a protective effect.
Commonly flagged
- Liver and kidney (300+ mg/100g)
- Anchovies and sardines (400 mg/100g)
- Herring (210 mg/100g)
- Beer and yeast extracts
Example Fennel checks
312 mg purines
78% of 400 mg daily limit
Verdict shown for default limits. Scales to your actual daily budget.
CKD Stage 3
Potassium · mg/dayPhosphorus · mg/dayPotassium and phosphorus: both accumulate when kidneys are moderately impaired
At Stage 3, kidneys may struggle to clear excess potassium and phosphorus. High potassium affects heart rhythm; excess phosphorus depletes bone mineral density. Limits are set by a renal dietitian based on blood results.
Clinical note
Phosphate additives (E450, phosphoric acid) in processed foods are almost fully absorbed, unlike natural phosphorus which is 40 to 60% absorbed. Check ingredient labels.
Commonly flagged
- Bananas and oranges (high K)
- Potatoes and tomatoes (high K)
- Dairy and whole grains (high P)
- Processed foods with phosphate additives
Example Fennel checks
430 mg potassium
14% of 3,000 mg daily limit
Verdict shown for default limits. Scales to your actual daily budget.
CKD Stage 5
Potassium · mg/dayPhosphorus · mg/dayPotassium and phosphorus: significantly tighter limits than Stage 3
Pre-dialysis and dialysis patients face tightly restricted targets that change with every blood test. Individual limits vary widely and can only be set safely by a nephrologist or renal dietitian.
Clinical note
Stage 5 targets are significantly stricter than Stage 3. Fennel ships conservative defaults; always enter your actual clinician-set limits in Settings.
Commonly flagged
- All high-potassium fruits and vegetables
- Dairy, nuts, and seeds (high P)
- Chocolate and cola (high P)
- Salt substitutes (contain potassium chloride)
Example Fennel checks
430 mg potassium
Exceeds Stage 5 limit
Verdict shown for default limits. Scales to your actual daily budget.
Coeliac Disease
Gluten · allergenGluten (allergen): even trace amounts trigger intestinal immune damage
An autoimmune condition triggered by gluten (a protein in wheat, barley, and rye). Immune activation damages intestinal villi and impairs nutrient absorption. There is no safe threshold; lifelong strict avoidance is required.
Clinical note
Certified gluten-free oats are safer but still cause reactions in a small subset of people with coeliac disease. Introduce carefully.
Commonly flagged
- Bread, pasta, couscous, and seitan
- Beer and malt-based drinks
- Soy sauce and many condiments
- Non-certified oats (cross-contamination risk)
Example Fennel checks
Contains gluten
Zero tolerance
Verdict shown for default limits. Scales to your actual daily budget.
Lactose Intolerance
Lactose · allergenLactose (allergen): milk sugar that insufficient lactase cannot break down
Insufficient intestinal lactase means lactose reaches the colon undigested, where gut bacteria ferment it, causing gas, bloating, and diarrhoea. Tolerance thresholds vary widely: some people manage small amounts, others cannot tolerate any.
Clinical note
Hard aged cheeses (cheddar, parmesan) and live-culture yoghurt are often well tolerated because much of the lactose is broken down during fermentation.
Commonly flagged
- Cow's milk (full-fat and skimmed)
- Soft cheeses: brie, ricotta, cottage
- Ice cream and cream
- Whey-based protein supplements
Example Fennel checks
Contains lactose
Exceeds typical threshold
Verdict shown for default limits. Scales to your actual daily budget.
IBS / Low FODMAP
FODMAP triggersFODMAP triggers: fermentable carbohydrates that drive gut symptoms in IBS
FODMAPs are poorly absorbed short-chain carbohydrates rapidly fermented by gut bacteria, causing bloating, pain, and altered bowel habit in IBS. The low-FODMAP diet is followed in structured elimination and reintroduction phases under a dietitian.
Clinical note
Low-FODMAP is not a permanent diet. After elimination, foods are reintroduced systematically to identify personal triggers. Most people tolerate some FODMAP groups.
Commonly flagged
- Garlic and onion (fructans)
- Apple, mango, and pear (fructose)
- Wheat and rye
- Lentils and chickpeas (GOS)
Example Fennel checks
Fructans: high FODMAP
High trigger; avoid during elimination
Verdict shown for default limits. Scales to your actual daily budget.
Type 2 Diabetes
Carbohydrate · dailySugar · dailyCarbohydrate and sugar: daily budgets to help manage blood glucose
Carbohydrate, including starches and sugars, has the biggest effect on blood glucose. Fennel tracks your daily carbohydrate and added sugar against targets and favours low-GI, high-fibre choices. A common starting point is around 130 g carbohydrate and 50 g sugar per day, but set your own targets with your care team.
Clinical note
Portion size matters: the same food raises blood glucose more in larger servings. Pairing carbs with protein and fibre slows glucose absorption, and low-GI, high-fibre carbs are gentler than refined ones.
Commonly flagged
- White bread and white rice (high carb)
- Potatoes, especially mashed
- Corn flakes and puffed rice cereals
- Sugary drinks and fruit juice
Example Fennel checks
15 g carbs per slice
Moderate carbs: counts toward your daily total
Verdict shown for default limits. Scales to your actual daily budget.
Ready to track your conditions?
Free to use. Select any combination of conditions during onboarding.