Effective Athlete Nutrition Support, Explained

Ask an athlete what a perfect week of eating looks like, and most can tell you in detail: the meal timing, the protein target, the pre-game carbohydrate load. Ask what happens when that week gets wrecked by a missed flight, a bad grade, or a coach's new demand, and the answer often gets quieter. Gemma McGuinness, a performance nutritionist, co-founder of Verus Performance, and a former professional footballer who played at international level, has spent her career in that quiet gap. Her argument, made across a long conversation with Sigma Nutrition Radio host Danny Lennon, is that the gap is not a failure of discipline. It is a sign the standard was never built to survive contact with real life.

McGuinness starts from a reframe. Nutrition, she says, should not be treated as a tool that only matters when performance is on the line. It should be an investment in health and wellbeing that happens to also support performance (05:36).

"Viewing this as a much more of an investment that provides benefits that's linked to your performance, but also benefits that's linked to your health and just your general wellbeing throughout the day." — Gemma McGuinness [05:36]

That collapse is not really about food. It is about identity. Many athletes, McGuinness says, build their entire relationship with nutrition around being an athlete: these are the rules I follow because this is who I am. The trouble comes when that identity is removed, by injury, by retirement, by a scholarship that does not pan out. Without the anchor of competition, the eating pattern has nothing to hold onto (10:50). McGuinness lived this twice. At eighteen, feeling pressure rather than choice, she stepped away from football entirely and spent two years bodybuilding. When she returned to the sport, she promised herself she would simply enjoy it. Old habits crept back anyway. She began a master's degree in performance nutrition at the same time she was playing, and applied every target she learned with precision. The numbers looked right. The experience did not.

"I wasn't really relaxed around food, felt more pressurized." — Gemma McGuinness [15:58]

The fix, for her, was not more discipline. It was time away from the sport entirely, living in Vietnam, exploring interests that had nothing to do with football, and coming back with a different question in hand: what actually brings out the best in me, rather than what am I supposed to do because I am an athlete. That question, applied to clients now, is where her practical framework begins.

Standards that survive a bad week

The framework has a name that sounds almost too casual for something built on years of watching plans fail: Good, Better, Best. The idea is to let an athlete define their ideal week, the one where everything goes right, and then deliberately scale it down to a version that still counts as success when things go wrong (22:12). McGuinness poses the test directly.

"If you can't stick to this whenever things go wrong, is that high standards, or is that just a lot of pressure that you're putting on yourself?" — Gemma McGuinness [22:56]

This is the sharpest idea in the conversation, because it reverses a common assumption in sport, that a high standard is defined by its difficulty. McGuinness's version says a standard is only high if it is durable: if it can be met, in some reduced form, during the week an athlete gets injured, or fails an exam, or simply runs out of energy. Crucially, the standard has to come from the athlete, not be handed down. When an athlete sets their own floor, McGuinness has found, they are far more likely to hold themselves to it, because the accountability is internal rather than imposed (23:19).

Alongside this sits a second tool borrowed from behavioral psychology: implementation intentions, or if-then planning. McGuinness asks athletes to name the situation that most reliably knocks their nutrition off course, a late game, a stressful exam week, a travel day, and to decide in advance exactly what they will do when it happens again. She is candid that the plan often still fails the first few tries. What changes, she says, is the thinking underneath it, usually within four to six weeks of practicing the habit of noticing and responding (27:09). Reviews matter here too. McGuinness treats a nutrition review the way a coach treats game footage: look first at what went right, the protein added, the pre-training carbohydrate taken, before addressing the one thing that slipped (27:28).

Even with good planning, performance nutrition has a measurement problem that other domains do not share. A client trying to lose weight has scales and tape measures. A client managing blood pressure has a number from a cuff. An athlete on a team, competing in a sport where results depend on teammates, opponents, referees, and luck, has no such clean output. McGuinness ran an informal audit of this problem: across more than 100 clients who filled out a pre-consultation form, the average person listed five different "primary" goals, some of which quietly worked against each other (30:29). Picking one clear outcome, she says, is a challenge in itself.

Her answer is to lean on a single, consistent proxy: energy levels. It is subjective, but it is reliable, easy for an athlete to notice, and quick to shift once nutrition changes take hold (31:10).

"I think in sport, one consistent measure that we can see if nutrition linked to performance is energy levels." — Gemma McGuinness [31:10]

The environment around the plan

None of this happens in isolation. McGuinness spends real time on the environment surrounding an athlete, because the same disciplined mindset that builds consistency can, past a certain point, tip into something that no longer serves the athlete at all (35:10). She sees this most often, in her own recent client work and in locker rooms she has been part of, among female athletes for whom strict, disciplined eating was once praised and is now, sometimes, a quiet form of disordered eating. The way out, she argues, is not less structure but more honest reflection: asking whether a rule is still serving the athlete or simply running on inertia.

At the team level, McGuinness points to a single diagnostic question for judging whether an environment is genuinely high performance: how safe does it feel to raise a concern.

"How safe does it feel to raise concerns? So if there are problems, can both the staff and the player or the athlete just openly raise that without feeling judged." — Gemma McGuinness [39:17]

She describes a moment from her final season with the English club Bournemouth's women's team, when the leadership staff asked the playing group a deceptively open question: if you had a blank sheet of paper, and no obligation to copy the men's team or any other team, what would the best possible environment for this squad look like? The players who helped write the standard were the ones who held themselves to it afterward, McGuinness says, because breaking a rule you set yourself feels different from breaking one imposed on you (40:53).

The same logic scales down to something almost mundane: how information gets delivered. McGuinness's clearest piece of advice for practitioners is to abandon the big workshop in favor of small, specific explanations tied to what athletes are already doing, why this morning check-in, why this particular meal timing (43:08).

"Being able to educate, like nuggets of education and being able to create a sense of why for a lot of things, I think is just not recognized enough." — Gemma McGuinness [43:08]