How to ruin a week of training (with your nutrition)

We’ve all done it.

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You open Instagram for five minutes and come away questioning everything you ate that day. One podcast says caffeine is the ultimate performance enhancer. Another says if you drink it within 90 minutes of waking, you’ll destroy your hormones. Train fasted for fat adaptation but also never train fasted or you’ll lose all your muscle gains and shrivel up like an OAP. Broccoli heals the gut but also Broccoli destroys the gut. It’s no wonder so many of us feel confused.

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I don’t have a magic nutrition formula for everyone. But I do see the same three mistakes quietly sabotaging people’s training weeks over and over again. Every time I think we have moved on… they gain traction again and the conversations start again.

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The first is falling for “magic” supplements.

Supplements aren’t inherently bad. Some are genuinely supported by strong research. Caffeine, for example, is one of the most studied performance aids in sport. Large meta-analyses of randomized controlled trials show it can improve endurance performance by roughly two to four percent. That might not sound dramatic, but over a marathon that’s minutes. Creatine monohydrate consistently improves high-intensity strength and power output in controlled trials. Protein supplementation can help if your daily intake is too low.

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But here’s the problem.

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Most recreational athletes are under-fuelled, under-recovered and under-slept, yet somehow over-supplemented. Greens powders, fat burners, mushroom coffees, lactate blockers, collagen waters. You can spend a small fortune before you’ve even cooked a proper meal.

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Research consistently shows that total daily energy intake and adequate protein drive adaptation far more than exotic products do. A meta-analysis in the British Journal of Sports Medicine found that protein supplementation improves strength and muscle gain primarily when overall protein intake is insufficient. If you’re already eating enough, the benefit shrinks significantly.

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Before buying another tub of something, it’s worth asking a simpler question. Are you eating enough carbohydrates to fuel your sessions? Are you getting sufficient protein across the day? How varied are your fruits and vegetables this week?

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Supplements can fill gaps. They SHOULDN’T replace foundations.

The second mistake is hiding behind “if it fits my macros.”

Yes, calories matter. Energy balance matters. But performance nutrition isn’t just maths... shame! I LOVE MATHS

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Endurance athletes who chronically under-fuel show measurable hormonal disruptions. We have all had that feeling mid-run where our energy dips and our legs simply won’t go any faster… Think this but on a much larget and more detrimental scale! Research into low energy availability demonstrates reductions in metabolic rate, testosterone, thyroid hormones and bone health when intake doesn’t match output. You can train hard for a while like that, but eventually something gives.

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On the other side of the spectrum, burning a thousand calories in a long run doesn’t automatically mean your recovery meal should be a free-for-all. No food is forbidden. But if you’re training like an athlete, it makes sense to refuel like one.

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If your carb intake is aligned with training load, its going to improve glycogen restoration and subsequent performance – We are thinking today about our sessions tomorrow and the next day, and the next….

Protein intake in the range of roughly 1.6 to 2.2 grams per kilogram of bodyweight per day supports repair and adaptation. Diet QUALITY influences micronutrient intake, immune function and recovery. Calories aren’t just numbers. They carry information.

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An occasional burger won’t ruin your progress. But if a large percentage of your weekly intake comes from heavily processed foods, energy fluctuations and sluggish recovery shouldn’t come as a surprise – Fuel with shit and feel like shit!

The third mistake is chasing detoxes.

Every year the same promises appear. Juice cleanses. Tea detoxes. Three-day resets. Flush toxins. Restart your system... it gives me the Ick

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I get it though, it sounds appealing. Clean slate. Fresh start. The videos can seem very convincing.

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But in healthy individuals, there is no strong evidence that juice cleanses or detox teas remove toxins. Your body already has a sophisticated detoxification system involving the liver, kidneys, gut and lungs. They work continuously without the need for a celery juice or apple cider vinegar starter to kick off your day.

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Ironically, extreme detoxes often reduce protein intake and total energy availability, which can increase stress hormones and impair recovery. For an athlete trying to train consistently, that’s a step backwards.

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If you genuinely want to support your body’s systems, the answer is far less glamorous. Eat adequate fibre. Consume a wide variety of plant foods. Stay hydrated. Limit alcohol. Sleep properly. Do that consistently for months and years not five dramatic days.

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The boring stuff wins.

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Most weeks of training aren’t ruined by one missed workout. They’re chipped away by inconsistent fuelling, overcomplication and chasing quick fixes.

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The everyday athlete doesn’t need magical powders or extreme resets. They need enough food, enough variety, and enough consistency to support the work they’re doing.

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Ignore the noise.

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Eat like someone who wants to perform.

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About InnerFight

InnerFight is a premier fitness and endurance coaching company based in Dubai. Whether you’re a busy professional seeking peak performance or an athlete pursuing ambitious dreams, InnerFight offers a supportive community where hard work, honesty, and simplicity drive extraordinary results.

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• The InnerFight Blog delivers expert articles from certified coaches
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