Nausea and vomiting several times after eating food bars

NOTE: If you have any issues with food bars or Soylent, please email Please be sure to note batch number and any other relevant details.

Fervent Soylent 2.0 user here. I used powdered Soylent back in the days before 2.0. I often use 2.0 on weekdays.

When food bars first came out about a month ago, I eagerly ordered a couple boxes to try out. I am ambivalent about the pricing model but that’s for another post. Had numerous bars in the weeks to come with no issues. Loved the taste and convenience.

Having had good experiences up until this point, I decided to bring some food bars along for my vacation in Europe. Then the trouble started:

  • Vomited on the airplane to Europe. Contents of stomach: food bar, half a cliff bar and some airplane food (go figure). Vomited about 4-5 hours after consuming the food bar.
  • Vomited a week and a half into trip, 2 hours after consuming food bar. Nothing other than a food bar had been consumed that day. Also had diharrea. I was out of commission for the rest of the day.
  • Vomited 2 weeks into the trip (today), 3 hours after consuming part of a food bar. This time I cautiously only ate 1/5th of a bar. Nothing other than a food bar had been consumed that day.

I am not prone to stomach issues. I had never vomited on a plane before (I’ve flown many times before, probably at least 30 times, but never had had a reaction like this). I didn’t have any stomach issues on the days that I didn’t consume food bars.

As much as I enjoy the taste of the bars, I have no choice but to abstain from eating them until I can figure out what’s going on. My schedule was significantly disrupted by my reaction to a bars, and I’m very frustrated. I almost missed a rare opportunity to visit an old-time friend in Europe because of these issues (ended up driving 9 hours the next day instead of previous plans).

I don’t have batch numbers from the first incident, but here are details from the 2nd and 3rd:

  • “03:55 B. B. 14JUL17 F3 1966”
  • “04:04 B. B. 14JUL17 F3 1966”

NOTE: Not sure if this is relevant, but I noticed that both wrappers had a light, yellowy residue inside as if they had been heated at some point during travel. It’s possible that the hot weather has caused them to melt and then remold a bit.

Here are some pictures:

Adverse reports so far (51 and counting):

2016-09-07 Raylingh
2016-09-10 BitBucket
2016-09-20 SoySister
2016-09-23 jteach
2016-09-24 demotivator
2016-09-24 maloncanth
2016-09-25 rlpowell
2016-09-26 G_Gordon_Worley_III
2016-09-26 mcsquared88
2016-09-27 jhum
2016-09-27 gilahacker
2016-09-29 splender
2016-09-30 misterchief
2016-10-02 Martha_Starr
2016-10-03 majorsteel
2016-10-03 rustman
2016-10-03 Candleknight
2016-10-03 ScoobyMaroon
2016-10-03 flipflopsnpolos
2016-10-04 karl_nj
2016-10-04 coughlin382
2016-10-05 TipsFirstStupid
2016-10-05 rhaikh
2016-10-05 jermacide
2016-10-05 cwoodson
2016-10-05 dudeseeg
2016-10-06 dguido
2016-10-06 Sickness
2016-10-06 jpeddicord
2016-10-06 pernambuco
2016-10-06 zhoujianfu
2016-10-06 Jourdnormous
2016-10-06 WestTexasRedneck
2016-10-06 Equipoisonous
2016-10-06 FirebirdAhzrei
2016-10-06 dharmabumstead
2016-10-07 ASEKMusik
2016-10-07 holylivingfuck
2016-10-07 torley
2016-10-07 daxem2k
2016-10-08 shinreyu
2016-10-08 jonlong
2016-10-08 soylentkiwi
2016-10-09 kbd
2016-10-09 madcow3417
2016-10-10 facingthegods
2016-10-10 xslambx
2016-10-10 afarcrytoyou
2016-10-10 snugy_wumpkins
2016-10-10 Zncon
2016-10-10 okstfan03

(see spreadsheet)


Sounds like you’re allergic to something in the bars. I’d just stop eating them, but if you really want to wait and try a different batch, you might want to give it a shot.

1 Like

That yellow stuff looks like melted bar to me but it’s hard to tell from a picture. Your symptoms do sound like classic food poisoning.


Probably not. OP said they had numerous bars in the weeks before, with no issues.



Only thing I don’t understand is why food bars seem to be the common thread. In each instance I can’t isolate anything other than soylent as the root cause (perhaps other than the airplane food, though I wasn’t aware of anyone else having issues).

In each case, I reacted within 3-5 hours of consuming the food bars.

I find it slightly amusing that we are so used to food with preservatives that a product like Soylent is giving us so much trouble.


It’s possible that heat caused the bars to melt & remold. Or it could be mold.

I assume you are drinking plenty of water with the bar? Do not forget, it could be the water since you are in a different country.


Did you email into us ( I’d like to investigate this further.

Done Conor, thanks.

Please forgive the delay, I am still on vacation

I’ve had a vaguely similar experience. While I never vomited after having a Food Bar for breakfast (along with a small cup of coffee or hot cup or tea) I did feel noticeably nauseous a few hours later.

The worst was on a work-related trip recently. We ate at various places throughout the day (no one else became ill or reported feeling ill) and I had a Food Bar in the hotel room and in the middle of the night I woke up feeling as though I would vomit. Luckily I didn’t but I associated it with the Food Bar based on previously feeling ill after having nothing but a Food Bar and coffee or tea then feeling ill, then it fading and having “traditional” food later on.

I actually have about half of my first box of Food Bars left because I’m not sure if they’re the culprit or something else. The only common factor is each day I felt ill was a day I had a Food Bar.

I do recall a residue inside the wrapper but it’s not a clear memory and I remember thinking that this may be normal because it was the first one I’ve ever opened. I remember one Food Bar was a bit inflated/puffy with air but still sealed while the others were not. If I think about it I’ll open another bar or two on Monday and look for residue.

I can say that the very first Food Bar I had seemed okay and my GF had about half with me and I don’t recall any illness associated with that first one.

If I had to describe the illness it would be something I’ve felt after having too much sugar or cake frosting or something like that.

Hello Conor. I emailed info about 10 days ago, and haven’t heard back yet. Any idea when I can expect a response?

Pm me with the email you used to contact us. I’ll flag the ticket.

Hello Raylingh. I ate newly shipped bar on 9/1. An hour in I was puking & having diarrhea, lasted 12-hours. Thinking I’d experienced stomach flu I ate another the next week with more intense symptoms & profuse sweating. Like you, absolutely no problem with the first shipment. Was shipment #2 this lot? 08:42 B.B. 14JUL17 F3 1966

Per Soylent, there investigation has revealed nothing, and say I must have an allergy or sensitivity to the bar … which is essentially the same as the drink that I have no issue with.

Have you made any concrete discoveries for your reaction?

Thank you very much for sharing your experience. I debated posting this publicly or not and ultimately decided to in hopes of getting other user accounts to aid in troubleshooting.

The only batch numbers I have are the ones posted above. These are the numbers of two bars that we’re known to cause me trouble:

  • “03:55 B. B. 14JUL17 F3 1966”
  • “04:04 B. B. 14JUL17 F3 1966”

The second bar I only ate a small piece of several days after the previous reaction, to ensure it was the bar (I had nothing else to eat that day). Sure enough, a few hours later it was forcefully regurgitated (I say forcefully because I can usually stave off vomiting when I have car nausea or sea sickness).

I find it extremely odd that I reacted fine to earlier bars in the same shipment. I have no known allergies or food sensitivities.

By chance, were you traveling when you had the issues? Were your bars subjected to heat before you ate them, when you reacted?

I’ve PMed my details to Conor, so hopefully I’ll have more details from the Soylent team soon.


I’ve done it many times. It’s not a big deal. If you have a good spam filter (e.g., use a good major email provider), you’ll be OK. If not, you’ll get tons of spam whether you post your email address here or not.

Yeah, not like it’s not out there anyway.

The curious thing for me (and I felt very nauseated from bars as best I can tell) is these symptoms mirror my reaction to Soylent v1.1 which had “enzymes” to try and reduce gas. I would get REALLY warm feeling and then about 3-4 hours (if I recall correctly) after drinking 500ml I would vomit my guts out.

The symptoms I felt after eating Food Bar were similar minus the vomiting. If I did vomit I’d say the symptoms were similar although the nausea and feeling warm were less intense with Food Bar.