When Digestion Loses Capacity: Why Food Suddenly Becomes a Problem

After Christmas, my digestion stopped coping with foods it would usually manage. Fat-heavy meals, slow-cooked foods and richer combinations triggered immediate reactions. This wasn’t random, and it wasn’t because those foods had suddenly become “bad”. It was an intolerance driven by insufficient digestive juices and enzymes.

Digestion depends on the coordinated release of stomach acid, bile from the gallbladder and enzymes from the pancreas. When these are produced in adequate amounts, food is broken down efficiently and absorbed without issue. When they’re not, food remains partially digested and the immune system has to step in. That’s when symptoms appear.

This is what’s often misunderstood about food intolerances. In many cases, the problem isn’t the food itself but the body’s reduced capacity to digest it. After periods of excess, stress, routine disruption or nervous system overload, digestive output commonly drops. The system simply can’t meet the demand being placed on it.

Fats and slow-cooked foods tend to expose this first. Fat digestion is one of the most demanding tasks the body performs and relies heavily on bile flow and pancreatic enzyme output. When either is sluggish, fat sits in the digestive tract for longer, triggering immune responses and symptoms. Slow-cooked foods and broths can also be higher in histamine, adding another layer of stress when digestion is already compromised.

Digestive insufficiency doesn’t always show up as obvious gut pain. For many people, it presents as throat mucus, post-nasal drip, reflux, chest tightness, bloating, fatigue after meals or a general sense that the body is reacting rather than digesting. These are all signs that food is reaching the immune system before it has been properly processed.

This drop in digestive capacity doesn’t happen in isolation. Stress, grief, nervous system dysregulation, past toxic load, medication use, antibiotics, and periods of dietary excess all reduce digestive signalling. The body prioritises survival over digestion, and digestive output is one of the first things to be downregulated.

In my own case, a history of alcoholism, toxicity and long-term nervous system dysregulation means my system reaches that threshold more quickly. But this pattern is incredibly common, even in people with no obvious health history. Christmas, holidays and stressful life events are some of the most frequent triggers I see.

If this resonates, the first step isn’t restriction, it’s reducing digestive demand while the body rebuilds enzyme and bile output. That means choosing foods that are warm, simple and easy to break down, eating regularly, and avoiding the urge to push through with heavier meals while symptoms are present. Think less stimulation, more support.

A simple example meal during this phase might be a small bowl of rice congee or well-cooked white rice, freshly cooked chicken or turkey added at the end, and gently steamed vegetables such as carrot or courgette. Minimal fat, eaten warm, slowly, and without distraction. This kind of meal nourishes without overwhelming the pancreas or gallbladder and gives the digestive system space to recover.

As symptoms settle and digestion strengthens, foods can be gradually reintroduced. In most cases, when digestive capacity is restored, the intolerance resolves.

Symptoms are not a sign of failure. They are feedback. And when we understand what they’re actually telling us, we can respond in a way that supports the body rather than fighting it.

If you’d like structured guidance on how to do this step by step book a discovery call below or book onto one of my programmes.