A friend and I were trying a ketogenic/very low-carb diet and I quickly learned that starting a new diet that tracks uncommon macronutrients is an exercise in container twirling. Barbecue sauce is high sugar as is ketchup. Some light salad dressings are problematic in addition to whole classes of foods.
We purchased deeply of cheese, pepperoni, sour cream, cream cheese, seafood, bacon, and other meats with broccoli and spinach as our greens of choice. It was expensive, or so I thought, until I returned and realized the enormous quantity of food I had purchased. My normal purchasing pattern is “what will I need to stock my kitchen” rather than “what will I need to last me the x days until I go food shopping” which can result in overbuying and spoilage if one doesn’t eat enough.
Dinner that evening was buttered chicken thighs and dessert was a fist full of almonds. Our snack was pepperoni and cream cheese. To dieting.