Consistency is the whole point, and you are better built for it.
Three practical things today. Eat protein before midmorning, since a coffee-only start is the reason afternoons collapse, and the fix costs four minutes. Second, get your eyes off close-range screens every half hour and look at the furthest thing you can see for twenty seconds, which resets the focusing muscles and heads off the tension headache that starts behind the eyebrows. Third, walk after your largest meal, ten easy minutes, no destination in mind, because digestion improves and so does your sleep hours later. None of this is dramatic. Consistency is the whole point, and you are better built for it than most.