As above, could your two very active teenage boys take some responsibility for their own, and their family's, nutrition? (Are they active through organised sports, and if so, do their coaches educate them on nutrition and taking responsibility for their own nutrition?)
If they're not already able to cook meals, could you try giving each of them the task of cooking dinner for one night a week (and if it works with their schedules, on the nights that you are most time-poor)?
They would learn how to make decent food for themselves and others, appreciate what you have been doing for them all these many years, and be able to contribute to the overall smooth running of the family.
This approach would also recognise that they are growing up and becoming more capable and independent, but might need a further element of something in it for them - are they wanting to stay out later, roam further from home, other freedoms associated with adulthood? If so, perhaps you can discuss the balance of rights and responsibilities - with the expectation of being treated in a more adult manner comes the expectation of them acting in a more adult manner, which might mean doing more tasks around the house.
If they're not interested in doing some cooking, could they do other elements of the housework to free up more of your time and headspace? Could you also explain how you are feeling to your sons, and explain that it's really not great great for your health, and that you need them to help you out a bit in the same way that their dad takes responsibility for jobs contributing to the running of the home?
Good luck with whatever changes you decide to try. I hope you find some things that work for you and your family.