Women routinely apologise for eating — to colleagues at lunch, to friends at dinner, to themselves internally. 'I shouldn't really.' 'I'll have to work this off.' The pattern damages relationship with food and models disordered patterns to others.
What to do instead
Eat what you want without commentary. If you're enjoying the meal, say that. Skip the 'guilty pleasure' framing.
Why this matters
Food guilt is more harmful than most actual food choices. Modelling matters for daughters, friends, female colleagues. Most apologising is performative anyway.