Similar to studies of adults post-bariatric surgery, the patients in the Teen-LABS cohort did have some detectable micronutrient deficiencies at follow up. In adults we commonly diagnose and treat these deficiencies (e.g. iron, B12, Vitamin A), and may even prophylactically treat these patients.
Historically, some adults may have been hesitant to undergo a bariatric/metabolic procedure because of the "unknown" long-term effects. Studies like the Swedish Obesity Study, LABS, and prospective randomized trials like STAMPEDE (Surgical Therapy and Medications Potentially Eradicate Diabetes Efficiently) have be excellent sources of collecting this much needed long-term data.
From the perspective of children who may be continuing to grow and have different nutritional requirements than adults, is/are there any concerns that nutritional deficiencies may manifest differently or have different long-term consequences to a still-developing/growing person?