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Depends on what kind of leftover fat.
If frying something in measurable quantities of oil, the oil can be filtered to remove solids, then stored to re-use later.
If cooking something greasy like bacon or sausage, either I'll cook other things in the same pan after, or I'll pour it through a strainer, let it cool, and freeze it. Once I've saved a bunch, I clarify it.
Fat is flavor. In my house, it doesn't get thrown away. There are lots of ways to reuse it.
Reusing cooking oil causes cancer. I thought this was wildly known, but I'm consistently surprised at how many people online say things like this.
This is why "drip jars" stopped being used in the 20th century. There used to be one in every house until it was understood it causes stomach cancer.
https://www.adityabirlacapital.com/healthinsurance/active-together/2025/01/27/cooking-oil-and-cancer/
https://www.sfa.gov.sg/food-safety-tips/food-risk-concerns/risk-at-a-glance/reusing-cooking-oils
But singapore site links USDA q&a on how to reuse it safely and has section for "what you need to do if you reuse oil". They don't particularly advice or encourage single use.
Oil quality is dependent on storage method (strain it with filter, keep airtight non-transparent container etc) and cooking temperature so people need to be informed, but I don't see reusing it once or twice with appropriate care cause significant harm.
That's if you take it beyond the smoke point. Which you wouldn't do if you are trying to avoid free radicals in your food to begin with. Even vegetable oil is extracted through a heating process.
Popcorn made in pre-used oil can be awesome, and an easy way to get rid of 100ml or so.
Omfg...bacon grease popcorn...I'm about to take 10 years off my life
Hell yea. I used some oil recently that had be used to good something (IDK.. housemate food) with heaps of curry powder flavours and some chilli. That was awesome.
Then there was that time in college I tried to re-use oil I had previously fried shrimp in.
Turns out shrimp-flavored popcorn is not an enjoyable experience!
Some lessons only take once to cement the learning for a lifetime.
Haha, yeah. Also, anything with too many burnt carbs is not great.
What kind of filter?
Sounds pretty good. Oil is expensive too.
Citation needed.
A generic insurance website is not a citation.
And literally everything causes cancer.
People have reused cooking oil for millennia.
Here's another website. Google used to be so much easier to use.
https://www.sfa.gov.sg/food-safety-tips/food-risk-concerns/risk-at-a-glance/reusing-cooking-oils
Singapore is a solid source, right? It's bizarre to me that this isn't more widely known.