It looks like life on the road is definitely getting the best of this couple here. In fact, fans have long been speculating about Jill Duggar and her husband Derick Dillard's health ever since the couple moved to Central American as part of their missionary trip.

Now, fans are worried that something serious must be up after Jill posted a photo of the couple on her Instagram account on Friday. In the photo, Derick looks thinner and even a little paler than in previous pics.

A photo posted by Jill Dillard (@jillmdillard) on Feb 12, 2016 at 3:11pm PST

Some fans commented on the photo with, "What the hell is wrong with Derick?!" while another said, "I feel awful for Derrick. He has so many issues with the orthodontic device that broke his jaw. I hope they put his health as a priority. He simply looks unwell."

Another critic wrote, "Wow, I think Derrick needs to take a little more pride in his appearance! That or he must be sick. What's going on?"

So far neither Jill nor Derick have made any comments about the criticism, nor have they revealed their current location. Many reports earlier indicated that the couple might have left Central America due to the Zika vius. The couple share a 10-month old child together, Israel David.

Keep up with Enstars for all the latest news on Jill Duggar, Derick Dillard and all of your favorite reality television stars right here.

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Jill duggar, Derick dillard