You track every macro, every set, every recovery variable. The one system you have never programmed is the fluid that actually digests the food.
The duffel bag is a laboratory. Metallic blister packs with capsules popped out, white plastic pill bottles, a compact silver digital scale, loose foil packets of single-use pre-workout, and a crumpled sheet of paper covered in hand-scribbled numbers: morning weights, training sets, supplement times down to the minute. Everything is weighed, logged and optimised.
And then the recovery meal arrives. A perfectly portioned grass-fed ribeye, organic rice, the numbers all checked. Within thirty minutes the upper stomach swells so tight that the lifting belt becomes a constraint rather than a tool. Leg days get skipped because the gut is too bloated to brace under a squat. Morning runs with the kids stop because the impact feels like an oncoming digestive disaster. And at three in the morning, the same cold frustration: lying awake while the people closest to you quietly stop expecting things.
The identity of the person who can get through any physical barrier starts to slip.
The cupboard of shame
When the brick-in-the-stomach feeling first appeared after training, the natural response was to look for a mechanism. Instead, the search produced a loop of temporary patches.
Round one was the GP. Ultrasound clear, stool tests showed no inflammation, coeliac panel negative. The diagnosis was a sensitive stomach, the prescription was an IBS leaflet and a food diary. Cost: four months and no answers.
Round two was the pharmacy. Chewable antacids in the glovebox, a bottle on the nightstand, anti-diarrhoeals taken before long drives just in case. It was silencing the alarm rather than putting out the fire. Cost: twelve pounds a week, indefinitely.
Round three was the supplement cascade. Seventy-nine pounds a month for premium liquid probiotics, taken from the fridge every morning with a reminder on the phone, and no detectable change by day thirty. High-end enzyme blends taken before steak dinners like a talisman, while the brick formed anyway.
None of it worked, because none of it was aimed at the right biology. Probiotics and enzymes act on the lower intestine. The bottleneck is not in the colon. It sits upstream, in the gallbladder and the biliary tract, where the body's most concentrated digestive fluid can slow to a crawl.
Your macros are perfect. Your bile is sluggish.
To recover from high-volume training you eat dense, calorie-heavy meals: beef, whole eggs, avocado, clean oils. Every gram of dietary fat in those meals must be emulsified by bile before pancreatic lipase can finish breaking it down. That is not a preference of the digestive system; it is a physical constraint. Fat is hydrophobic. Lipase is water-soluble. Without bile acting as a surfactant to break large fat globules into microscopic droplets, the enzyme has almost no surface area to work on.
The sequence runs in a strict order. First, bile is released from the gallbladder. Second, fat is emulsified into droplets. Third, pancreatic lipase breaks the droplets down. Fourth, micelles form and carry the products across the gut wall. Step one gates every step that follows it.
When training volume is high and meals are heavy, the gallbladder works double-time to produce a sudden, concentrated stream of active bile. Where that pathway is sluggish, the fluid pools, thickens and does not arrive in the volume the meal demands. Two things happen as a result.
The nutrient lock
Vitamins D3, K2, CoQ10 and omega-3 fatty acids do not dissolve in water. To cross the water-based mucous layer of the intestinal wall they must first be packed into microscopic carriers called micelles, and micelles cannot form without a concentrated release of active bile acids. A significant share of the supplement stack that gets weighed out every morning may pass straight through unabsorbed, not because the doses are wrong but because the delivery system upstream is not keeping pace.
The stomach brick
Where the gallbladder cannot release enough fluid to emulsify heavy fats at the rate the meal demands, the food sits partly undigested in the upper tract for hours. Bacteria ferment what should have been broken down chemically, producing gas that stretches the gut wall. That is the pressure, the bloat, the belt that will not latch, and the three-in-the-morning distress that stalls the training week.
The gut is not broken. There is a fluid bottleneck, and it is upstream of every remedy in the cupboard.
What TUDCA is, and where it acts
TUDCA — tauroursodeoxycholic acid — is a bile acid that the human liver already produces in small amounts. As a food supplement, it is taken with food to support bile flow at its source, upstream of the bottleneck, before a macro-dense meal ever reaches the lower intestine where probiotics and enzymes do their work.
It supports the bile release a heavy meal calls for, at the moment it is called for. It supports the formation of the micelles the body needs to package, absorb and transport fat-soluble nutrients like D3, K2 and essential fatty acids. And because it acts upstream, it addresses the part of the chain that the cupboard of shame never reached.
What it does not do
No trial in people who train at high volume exists to say that TUDCA will make the belt latch on the same notch. That honesty is the reason a money-back guarantee exists rather than a timeline. The reasoning from physiology is straightforward — bile is rate-limiting for fat digestion, and TUDCA is a bile acid — but the population-specific evidence is not there, and stating that plainly is more useful than overpromising.
Beyond the gym floor
The bloat that interferes with bracing under a squat is the same bloat that makes a client dinner anxious, a long drive unpredictable, and a Sunday morning run with the family something to plan around rather than look forward to. The target is not one training session. It is the daily confidence that the stomach will not dictate the schedule.
That is the outcome this is aimed at, stated plainly rather than promised.