Most amateur cyclists and other amateur athletes do not need to have a formal sports nutrition consultation. This is because most amateur athletes do not ever get to the level of performance where adequate nutrition is a major issue.
For most amateurs, therefore, reading up on advice from other cyclists and in cycling magazines and books on how to stay nourished and well hydrated while on a ride is probably sufficient. You can ask your fellow riders what types of gels or other nutrition supplements they use and experiment with these until you find one that works for you.
On the other hand, if you are a professional cyclist then a nutrition consultation is probably a good idea. This is because the demands of professional training are often quite impressive, and it can be very helpful to have a professional nutritionist
making sure you are making your goals.
As always, the most important thing, while professional or amateur, while exercising is to do so prudently and not to overstep your limits. Dehydration is much more dangerous in the short term than any other nutritional concern and so, at a minimum, it is important to keep up with your fluid requirements while riding.
Please talk to your primary care doctor
for more information about staying healthy while exercising.