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How to Feed Your Horse the Way Biology Actually Intended

Here is something that sounds simple — but that most commercial horse feeding ignores almost entirely:

All horses are built the same at the cellular level.

The Shetland and the Warmblood. The Thoroughbred and the Fell pony. The 18-hand giant and the 12-hand miniature.

Different sizes, different breeds, different histories — but one fundamental biology. The same digestive system. The same metabolic pathways. The same cellular requirements. The same design principles.

And that biology — that fundamental design — has one clear message about what a horse is supposed to eat.
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What the Horse Was Designed to Eat

The horse is a non-ruminant hindgut fermenter. This is the biological classification that tells us everything we need to know about how to feed them.

Non-ruminant — unlike cattle and sheep, the horse does not have a multi-chambered stomach designed for batch fermentation. The stomach is relatively small, designed to receive food in a continuous, steady stream.

Hindgut fermenter — the primary site of fermentation and nutrient extraction is the cecum and large colon — the hindgut. This enormous fermentation chamber contains trillions of microorganisms that break down fibre into volatile fatty acids, which are the horse's primary energy currency.

What this anatomy is designed for: continuous, slow, fibre-rich intake. Grass. Hay. Browse. Movement while grazing. The horse in its natural state would spend 16–18 hours per day grazing, covering significant distances, consuming diverse plant material.

What this anatomy is not designed for: large, infrequent meals of concentrated, processed food.

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What Happens When We Feed Against Biology

When a horse receives large meals of grain or processed concentrate feed — particularly those high in starch — several things happen that the equine digestive system was not designed to handle:

Blood sugar spikes. Starch is rapidly converted to glucose in the small intestine, causing sharp rises in blood sugar and insulin. The horse's insulin system is not designed for repeated large glucose loads.

Hindgut acidosis. When starch reaches the hindgut — which happens when the small intestine's capacity is exceeded — it is rapidly fermented, producing lactic acid and causing the pH of the hindgut to drop. This kills beneficial fibre-fermenting bacteria, causes dysbiosis, and can trigger conditions including colic and laminitis.

Gastric ulcers. The horse's stomach produces acid continuously. When forage access is restricted — as it often is with concentrate-heavy feeding programmes, or horses with that are overweight on diets, or horses kept in a place where feed rations are restricted and they always run out before the next hay ration is given — there is nothing to buffer that acid. Ulcer prevalence in performance horses fed restricted hay alongside concentrate feed is estimated at 60–90%.

Metabolic disruption. Repeated insulin spikes, combined with the systemic inflammation created by gut dysbiosis, create the metabolic conditions associated with EMS, insulin resistance, and laminitis.

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The Nutritional Hierarchy of the Horse

Understanding what the horse actually needs — in priority order — transforms how you think about feeding.

1. Forage/Grass — The Foundation of Everything

Quality hay or pasture with grass if possible, is the absolute foundation of every horse's diet. It provides fibre for hindgut fermentation, physical bulk to buffer stomach acid, and the continuous trickle of food the digestive system is designed for.

No supplement, no concentrate feed, no special product replaces this. Forage and grass first. Always.


2. Water — Continuous, Clean, and Sufficient

A horse can drink 25–60 litres per day depending on size, temperature, and workload. Dehydration affects gut motility, increases colic risk, reduces cognitive function, and impairs every metabolic process.

Water access must be continuous. Never restrict water.

3. Minerals and Vitamins — In Bioavailable Forms

Most horses on a hay-based diet benefit from targeted mineral supplementation — because hay alone rarely provides the ideal balance of all essential minerals. 

The form matters enormously. Organic (chelated) mineral forms are significantly better absorbed than inorganic forms. A supplement with impressive numbers on the label but inorganic ingredients delivers a fraction of what it promises. And the body has a much harder time absorbing and utilizing all the chemicals from different commercial brands when they are not natural. 

4. Concentrated Energy — Only When Genuinely Needed

High-performance horses in hard work may genuinely need additional calories beyond what forage, grass and a good natural vitamine and mineral mix can provide. This additional energy is best delivered through fat and digestible fibre rather than starch — sources like soaked sugar beet, linseed, and quality fibre cubes are far more metabolically appropriate than grain.

For the majority of horses in light to moderate work, or for good-doers with metabolic tendencies, additional concentrate is either unnecessary or actively harmful.

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The 5 Feeding Principles I Apply to Every Horse

1. Forage is the medicine. Every improvement to a horse's health begins with getting the forage right.

2. Test, don't guess. Hay testing is accessible and affordable, and it transforms your ability to make appropriate decisions — especially for horses with metabolic sensitivities.

3. Feed for the individual biology, not the breed standard. A Thoroughbred and a native pony have different caloric needs but the same cellular nutritional needs. One size does not fit all in terms of quantity — but the principles apply universally.

4. Read every label. If the first ingredient is not a named forage, fibre, or quality protein source — be sceptical. If you cannot identify what most of the ingredients are — be very sceptical.

5. The body responds to quality. Chemically processed feed products, products containing corn and other grain-based ingredients, or low-quality cheap food is the most expensive decision you'll ever make for your horse's health — paid in vet bills, in supplement costs, in the chronic health conditions that develop over years of the wrong inputs.

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Ready to Transform Your Horse's Foundation?

→ The Ultimate Feeding Plan — the complete biologically-correct feeding framework for horses at every life stage and workload

→ The Overweight Horse  — when the metabolic picture needs specific attention alongside the nutritional foundation

→ Homemade Horse Treats — because treats should nourish, not harm

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