LPT: Use a hand basket instead of a cart for small grocery runs , the physical weight creates a natural "is this worth it?" filter that cut my impulse purchases by about 30%
I read about embodied cognition in behavioral economics and tested this for a month. My "quick trip" grocery bills dropped from ~$45 to ~$30 on average. I didn't buy less food — I just stopped grabbing snacks I didn't actually want.
The mechanism is simple: when your arm starts getting sore around aisle 4, every item gets a subconscious cost-benefit analysis. That $5 bag of chips suddenly feels expensive because your body is literally paying for it. With a cart, weight is invisible, so your brain treats the store like an all-you-can-grab buffet.
If you only need 3-4 items, skip the basket entirely and carry them in your hands. You'll be in and out in under 5 minutes because your brain wants to drop the load.
Obviously this doesn't apply to weekly family shops or heavy items like water/soda. Use it for the "I just need dinner ingredients" trips where 70% of a cart would normally be impulse grabs.