If not, is there a structure that will grammatically allow for that? Like "I eat right, exercise, stay consistent about it, and yet I've lost no weight in weeks!"
As discussed in the comments, you can use ～ても～ても for this:
Even though I've dieted, exercised, and kept myself from overeating, I still can't lose weight!
You can also use ～たり～たりする, but the meaning is slightly different:
Even though I've done all kinds of things like dieting and exercise, I still can't lose weight!
The core difference between these 2 options is that ～ても～ても is usually an exhaustive list of things you've tried (or is intended to resemble an exhaustive list), ～たり～たりする is intended to refer to examples of things you've done and is not intended to be taken as exhaustive. As a result, IMO, ～ても～ても comes off more whiney than ～たり～たり; the connotation with the first one being "I've tried everything!", the second being "I've tried a bunch of things".
If you really want to emphasize the repetition of the actions of eating right and then exercising as maybe say in a regime, you could use the V1てはV2 pattern, which 大辞林 describes as:
④ 繰り返される動作・作用について、前件と後件とを結ぶ。 「寄せ－返す浜の白波」 「ころんでは起き、ころんでは起きて…」
I'm going to assume you mean by eating right to mean mostly the amount as opposed to having a healthy (健康) well balanced diet. So then you could say
You can repeat it to even further emphasize the repetition:
In more casual language though, you might instead say