Cooked chicken breast at 140°F and my family staged a walkout. Am I actually right that it's safe?

So last night I did chicken breasts at 140°F (60°C) for 2 hours, normal supermarket breasts, about an inch thick. Best chicken I have ever produced, juicy, sliceable, actually tasted of something. And then it all went wrong at the table, because the middle had the faintest blush to it, my wife pulled up "cook chicken to 165" on her phone, and that was that. Kids followed her out like ducklings. I ate two portions out of pure spite and I'm fine, for the record.

Here's my problem: I THINK I'm right that holding it at 140 for that long makes it safe, that's what got me into sous vide in the first place. But when she asked me to explain WHY 140-for-hours equals 165-for-a-second, I waffled and lost the room. Can someone give me the actual explanation, and is there anything I should be double checking on my end? Because I would like to serve this chicken again without a family mutiny.

Been through the exact same standoff, mine was over 150°F thighs. What finally landed with my lot was me saying it's not "cooked to 140 and done", it's HELD there for over an hour, the holding is the cooking. The colour thing freaks people out the first time no matter what you say though. I still get called a mad scientist but they clear their plates now.

You've got the right idea, and your wife is quoting a real number, so let me give you the version that wins the argument fairly.

165°F (74°C) is the instant-kill temperature: at that heat, the bacterial reduction happens in about a second, so it's the right rule for anyone cooking without precise temperature control. But the underlying science is a time and temperature pair. Hold chicken at a lower temperature for long enough and you get the same reduction, it just takes minutes instead of an instant. This is standard pasteurisation practice in professional kitchens, not an internet hack. The blush you saw is a colour and texture difference at lower temperatures, not a doneness verdict.

Now the catches, because there are real ones. The pasteurisation clock starts when the core of the breast reaches bath temperature, not when the bag goes in, and that lag depends on thickness, so a fat breast needs meaningfully longer than a thin one. Get your times from a reputable published table for the thickness you're cooking rather than from memory or a forum reply, mine included. The site's food safety guide explains how the tables work and where they come from. And one non-negotiable: if anyone at your table is pregnant, immunocompromised, very young, or elderly, cook their food to the standard conservative temperatures. Those rules exist for exactly those eaters.

Follow the table for your thickness and your 140°F chicken is a textbook application, and genuinely better eating. Show her the guide rather than your own waffle, it tends to go down better from a chef.

My fix for sceptical eaters was simply not announcing the temperature until after they'd finished. Worked on my mother, who now requests "that chicken" and still doesn't want to know the number.

Update from the negotiating table: showed her the food safety guide, walked through the thickness table together, and we have signed a household treaty at 149°F, which frankly still produces incredible chicken. The kids remain suspicious of the word pasteurised because they think it's about milk. I'll take the win. Thanks all, especially Chef.