Should athletes’ nutritional strategies differ before competition versus practice?

I strongly believe that an athlete’s nutritional strategies shouldn’t differ before competition versus practice. My reason for this is that practice is just as important as the game itself (in terms of the player’s health/wellbeing/performance). If an athlete for example is ONLY getting adequate nutrition for the game...like for example if an athlete is only consuming enough iron on game day, they still risk having anemia considering one can’t make up for not consuming enough of a nutrient every single day by consuming enough of that nutrient just once a week (for example). This can lead to complications such as (if one is lacking iron) anemia, like I mentioned earlier, which in the long run can lead to lethargy, headaches, faintness (the feeling of nausea/feeling like passing out), a fast or irregular heartbeat, a weakened immune system, and of course, low blood oxygenation (as red blood cells carry oxygen and if one is lacking enough of them they will also be lacking oxygen in their blood). This is what lacking just a single nutrient can do to a person!!! Lacking nutrients puts an athlete at risk of many complications and can cause the athlete to bruise (easily) (and not heal), fracture bones (easily), experience nausea, tinnitus, delays in growth/development (for girls/boys under the age of 21 - when bones fully develop), a weakened immune system (which can lead to infection which can lead to DEATH), lack/lose menstruation (for girls/women), lose muscle mass, and in some cases, pass out, lead to organ damage, slow the heart rate to an unhealthy pulse (of 20s-30s OR LOWER), and even cause the athlete to collapse and DIE of malnutrition. Many athletes (we've probably all tried this at one point or another...) will stick to a very strict, restrictive diet throughout the week and during practice, then cheat right before game day in an attempt to make it up and succeed in the game, however doing so not only confuses one’s body and has their body go into starvation mode then store whatever energy it does get (and NOT use it as energy during the game), but it also risks so many other complications for the athlete. An athlete needs adequate nutrition EVERY SINGLE DAY they show up to practice considering they’re expending so much energy every second they exercise for, and without getting these nutrients EVERY SINGLE DAY the body will begin to BREAK ITSELF DOWN and the athlete will be putting themselves and their career in critical condition. Supplements, meals, snacks...it doesn’t matter where these nutrients are coming from, they need to be going into the athlete’s body and they need to be going in on practice days, game days AND even rest days.The body will do whatever it needs to survive. It will grow hair on the body if it’s lacking insulation (and is at a lower than normal body temperature as a result of dieting GONE TOO FAR - which is pretty common for athletes, especially young/new athletes as they're not aware of how the lower the body weight doesn't always equal higher performance...in fact a lot of the time it DOESN'T), slow down all the processes of the body to preserve energy, and BREAK DOWN muscle from THE ORGANS just to keep the organs going...but the body cannot keep doing these things for long before it comes to terms with shutting down. It is the athlete’s job to be sure they’re getting adequate nutrition and in good physical/mental health every day they show up to practice/games so they’re able to serve their body and their team to the best of their ability. If an athlete fails to do this they cannot and should not show up to practice/the game as it’s only fair to themselves and others. Therefore, if an athlete would like to be successful, healthy, and strong, the athlete SHOULD NOT change the amount of nutrients they consume each day unless they’re working with a nutritionist or other specialist who tells them this is what’s best for them. The athlete should instead prepare different, but equally nutritionally dense meals/snacks each day to fuel them for their sports. If they find they’re unable to meet the minimum nutritional guidelines doing this they can try supplements like vitamins and electrolytes to keep them healthy and strong for their sport. *An athlete should never perform a sport on an empty stomach either, and should eat and drink at least two to three hours before their game.