Does your horse's gut know what's coming?
Equine Metabolic Syndrome is a top risk factor for laminitis, and one that's often catchable long before a crisis.
If your horse is an easy keeper with a cresty neck that won't soften, you may be looking at Equine Metabolic Syndrome (EMS). What starts as a body-condition problem is really a signalling problem — and the gut sits closer to the middle of it than most feed rooms assume.
The short version
When your horse eats, blood sugar rises and the pancreas releases insulin to usher that sugar into cells. In horses with EMS this system gets overworked — cells stop responding well to insulin (insulin resistance), so the pancreas floods the blood with even more of it (hyperinsulinemia). Some horses also release an oversized insulin surge right after a sugary meal. Chronically high insulin isn't just a side effect — it can trigger laminitis on its own.
The gut connection
Hormones like GLP-1, released by the intestine after eating, help cue the pancreas on how much insulin to release. Researchers are studying whether an overactive gut signal is part of why some horses 'overshoot' on insulin — another reason gut health and metabolic health are so closely linked.
Why the microbiome matters
The gut microbiome helps shape this whole signalling chain — influencing how quickly sugars are absorbed, how incretin hormones like GLP-1 respond, and how much low-grade inflammation is circulating in the body, which can itself worsen insulin resistance. A microbiome that's out of balance may be quietly contributing to a horse's metabolic risk long before weight or insulin numbers raise flags.
Why test alongside bloodwork
For horses who tick a few of the boxes below, a gut microbiome analysis alongside standard bloodwork can add real value — it looks at what's happening upstream, and can help guide targeted nutritional support (alongside diet and exercise changes) rather than a one-size-fits-all approach.
Early signs worth watching
- Cresty neck or fat pads (tailhead, above the eyes, sheath/udder)
- Easy keeper — gains weight on very little
- Low energy, especially after meals
- Subtle footiness or weight-shifting on hard ground
- Faint hoof rings or stretched white line
- Trouble losing weight despite cutting calories
This article is general information and does not replace a veterinary examination. If your horse shows heat in the feet, a reluctance to move, or a sudden shift in weight, contact your vet.