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Recently had some guest at my house - while I was in another room one of the guest was sampling the food repeatedly and put the spoon from mouth back in the food. Is this a health concern? Does the food spoil faster?

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    You mean apart from the Eeeewwwwww!!! -factor? – Stephie Jul 18 '15 at 17:14
  • But on a more serious note: Sampling while still cooking, while on the table, from the fridge... what kind of food etc. More details make for better answers. Welcome to the site! – Stephie Jul 18 '15 at 17:16
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    And in case of starchy foods: cooking.stackexchange.com/questions/49766/… – Stephie Jul 18 '15 at 17:17
  • I wonder if this has similar connection to the recent study that found that double dipping is no worse than single dipping. – Catija Jul 18 '15 at 19:50
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    possible duplicate of Food safety when tasting from dish – Fabby Jul 19 '15 at 1:51
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Safety-wise: If the food is heated at least to 180° F/ 80°C, I'd like to cite Jefromi

But if you're just cooking for yourself I personally wouldn't really worry about it, because in general you'll be cooking the food at a safe temperature, not just above the danger zone (140F/60C) but something safe for all meat (180F/80C) so whatever bacteria you put in with your spoon is just going to get killed. We routinely put potentially contaminated things like raw meat into our food while cooking, and let the heat take care of it; whatever you might be carrying isn't any more dangerous.

and logophobe

Double-dipping isn't a big concern unless you're ill [...] You're probably introducing your friends and family to just as much contamination in the form of dust and such simply by having them in your home.

Quality-wise, as Stephie already pointed out: Liquids thickened with starch will liquidify if these come in contact with saliva (the enzyme amylase in particular). It breaks down starch to sugar.

  • Since I got cited here, I'd like to emphasize that I was only talking about cooking for yourself, and that the rest of that answer pointed out that this is really easy to avoid. Sure, it probably wasn't actually dangerous in this case, but there's also no need to gross anyone or risk contamination of something that's not going to get fully cooked. – Cascabel Jul 22 '15 at 1:53
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There are many health concerns with sampling food with a spoon and putting it back in the food. Saliva contains microorganisms/bacteria that may be harmful to us especially high risk individuals(pregnant persons,the elderly,those who are Ill) Pathogens can cause food borne illnesses or infections. Therefore it is better to practise safe food handling methods.

  • Not true. See upvoted answers. – Fabby Jul 19 '15 at 1:50
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Yes I would say there is a problem with sampling food and then putting the spoon back in the food. The food would now be contaminated with any bacteria this person was carrying around in their mouth. Not to mention the germ factor. As to spoiling faster I don't think that would make a difference. Maybe you should talk to your guest about doing this.

  • Not true. See other upvoted answers. – Fabby Jul 19 '15 at 1:49

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