Tomatoes Overview
Quick Carb Snapshot
- Carbs (per 100 g): ~4–5 g total, ~3–4 g net
- Carbs (standard portion): ~3–5 g net per medium tomato
- Glycemic Index: Low
- Best Substitutes: Roasted red peppers, zucchini
- Diabetic-Friendly? Yes (portion-aware)
- Keto-Friendly? Yes (moderation)
Key Traits
- Texture: Juicy, soft
- Flavor: Mildly sweet, acidic
- Carb Impact: Low
- GI / GL Notes: Minimal glucose impact in whole form
- Common Uses: Salads, sauces, soups
Best For
- Low-carb cooking
- Fresh salads and salsas
- Flavor bases
Avoid For
- Large quantities on strict keto
- Nightshade sensitivity
- Sugar-added tomato products
How Tomatoes Compare to Higher-Carb Ingredients
Texture & Structure
- Add moisture without starch
- Break down easily when cooked
- No thickening power
Flavor & Nutrition
- Contain vitamin C and lycopene
- Natural sugars but low density
- Very low calorie
How to Substitute Tomatoes
Low-Carb Swaps by Use
- Sauces: Roasted red pepper puree
- Fresh slices: Zucchini rounds
- Acidity: Vinegar + herbs
Tips for Successful Swaps
- Use ripe tomatoes for best flavor
- Cook down to reduce carbs per serving
- Avoid sweetened tomato products
Storage & Shelf Life
Pantry
Whole tomatoes can be stored at room temperature short-term.
Cooked
Fresh tomatoes keep 5–7 days refrigerated once cut.
Signs It Has Gone Bad
- Mold
- Sour smell
- Excess softness
Carb / Keto & Dietary Notes
- Carb Impact: Low
- Keto Use: Yes (moderation)
- Diabetic Notes: Safe whole-food choice
This information is for educational purposes only and not medical advice.
Allergy & Dietary Flags
- Gluten-Free: Yes
- Nuts: No
- Nightshade: Yes
- Vegan / Vegetarian: Yes
Carb & Dietary Tags
- Low-Carb: Yes
- High-Carb: No
- Keto-Friendly: Yes
- Diabetic-Friendly: Yes
- Low GI: Yes
Related Ingredients
Often compared to red peppers and tomatillos, tomatoes provide low-carb acidity and moisture in many dishes.