Foods to Avoid While Using Your Smart Start Ignition Interlock Device
Installing a Smart Start ignition interlock device (IID) is an important step toward regaining your driving privileges. While the device is designed to be accurate and reliable, some everyday foods, drinks, and products can temporarily affect breath test results, even when no alcohol has been consumed.
Knowing what to avoid and how to test properly can help you prevent unnecessary lockouts and stay compliant throughout your program.
If you’re new to the program, you can learn more about how Smart Start ignition interlock devices work here:
Why Certain Foods Can Impact an IID
Smart Start ignition interlock devices detect alcohol on the breath. Some foods and beverages naturally contain trace amounts of alcohol or fermentable ingredients that may briefly register if a breath test is taken too soon after consumption.
These situations are easy to manage with a little awareness and good testing habits.
Foods and Drinks to Be Cautious With
Fermented and Yeast-Based Foods
Foods made with yeast or fermentation may contain small residual alcohol levels, including:
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Bread, bagels, and pizza dough
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Rolls and pastries
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Sauerkraut, kimchi, and other fermented vegetables
According to Health Canada, fermentation is a normal food process that can produce trace alcohol.
For more day-to-day tips, visit our Ignition Interlock User Resources page:
Tip: Wait at least 15 minutes before testing after eating these foods.
Fruit and Fruit-Based Products
Overripe fruit can naturally ferment as sugars break down:
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Bananas
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Apples
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Grapes
Fresh fruit is generally safe, but avoid testing immediately after eating.
If you’re ever unsure, our Smart Start support team can help clarify what’s safe.
Foods Prepared with Alcohol
Some dishes are made using alcohol during cooking, which may leave trace amounts behind:
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Wine based sauces
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Beer battered foods
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Desserts made with rum, brandy, or liqueur
The Canadian Centre for Occupational Health and Safety notes that alcohol may not fully evaporate during cooking.
When possible, allow extra time before starting your vehicle.
Beverages to Watch
Certain beverages may contain alcohol or fermented ingredients:
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Kombucha
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Non alcoholic beer or wine
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Protein shakes or energy drinks with fermented additives
Health Canada regulates kombucha due to its potential alcohol content.
Always check labels if you’re unsure.
Everyday Products That Can Interfere
In addition to food and drinks, some common products can also affect a breath test:
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Mouthwash or breath sprays containing alcohol
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Hand sanitizer used immediately before testing
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Certain medications, including cough and cold syrups
The Ontario Ministry of Transportation (MTO) advises IID users to be cautious with alcohol-containing products.
Smart Start recommends choosing alcohol-free alternatives whenever possible.
Smart Start Tips for Accurate Testing
To help avoid false readings:
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Wait 15 minutes after eating or drinking before providing a breath sample
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Rinse your mouth with water prior to testing
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Avoid alcohol-based products before starting your vehicle
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Follow all on-screen prompts and device instructions carefully
For more information on ignition interlock requirements in Canada, visit Transport Canada.
If a reading does occur, remain calm and follow the directions displayed on your Smart Start device.
Support You Can Count On
At Smart Start Canada, we’re committed to helping drivers complete their ignition interlock program successfully. Our devices are designed for accuracy, and our support team is available to answer questions and provide guidance whenever you need it.
Staying informed and following best practices will help ensure a smooth, stress-free experience on the road to full driving privileges.