While the experts are chiming in: any recommendations for A). Sushi and B). Healthy Vegetarian / Wellness / Vegan / Juice Bar / Poke Bowl type spots? Thanks in advance!
Other thoughts (with very different ambience, price range, and focus):
Golden Era is generally delicious but maybe not that healthy in terms of salt and sugar.
Udupi Palace for nice dosa and uttapam options.
Dim sum at Lucky Creation for an unbelievably non-touristy Buddhist vegetarian experience.
If you're particularly looking for juice bar-oriented vegetarian places, Judahlicious is probably a clear candidate (they also have a specialty in raw food). Nourish Café is also a great option in this category.
I was personally not impressed by Seed+Salt or Vegan Picnic.
The vegan scene is stronger across the Bay in Oakland than in San Francisco proper. I love two spots that are not especially healthy: Souley Vegan (soul food) and Timeless Coffee Roaster (vegan baked goods that seem kind of impossible, plus coffee and chocolate).
But this is drifting quite some distance away from the original focus of the question.
You can also get a vegan poke bowl at, at least, Veggie Grill (a chain with its nearest location in Larkspur, over in beautiful Marin County) and Eatsa (a vegetarian bowl-oriented automat, with two downtown locations, where your food is made by unseen workers behind the curtain and appears inside of little boxes on the wall).
Hinata on Van Ness is omekase (chef's choice) and is among the best sushi I've had outside Japan. It'll set you back at least $90 (prix fixe, more if you drink the delicious sake), abd requires a reservation, but you'll be synced with two other couples if you sit at the chef's counter where you will get a detailed description of exactly what you're eating, why it's interesting, and what to look for.
Schedule your reservation to start before 7 and ask to sit at the Chef's counter with Dave (he's the owner, in his twenties and quite knowledgeable).
If you like Hawaiian/Asian fusion, for about the same price range, there's Liholiho in Lower Nob Hill. Liholiho has blown up for a year, so get there at 4:30 on a weekday to make sure you get a seat in the first wave. Otherwise, reservations are a 4-week wait (last I checked).
You can get good healthy vegetarian at just about any restaurant in SF (minus steakhouses and shabu shabu). For a quick delicious vegetarian lunch, check out Plant in the FiDi.
The Poke Bar at the Market at 10th and Market. It's by the Twitter building... so you get to experience the tech bubble at its apex plus amazing fish :-)
If you want the opposite of tech bubble, Ninki sushi in the Sunset has half price rolls many weeknights... instead of the tech bubble bursting, you'll be the one bursting because you'll be so full (and it's so cheap!)