What causes this catastrophic failure

NICE-recommended weight management strategies include: Dietary intervention aiming for a 600 kcal/day deficit through reduced portion sizes, limiting energy-dense foods, and increasing fruit and vegetable consumption Physical activity building up to 150300 minutes of moderate-intensity aerobic activity weekly, plus muscle-strengthening activities on at least two days weekly, in line with UK Chief Medical Officers' guidelines [10] Behavioural approaches including self-monitoring, goal-setting, and addressing emotional eating patterns Commercial weight management programmes such as those meeting NICE quality standards (QS127) Very-low-calorie diets in specific circumstances, under clinical supervision and for limited periods For patients with a BMI 30 kg/m (or 27.5 kg/m in those of South Asian, Chinese, or other Asian family origin) who have not achieved adequate weight loss through lifestyle measures alone, pharmacological interventions may be considered

Your provider can explain trade-offs based on your goals and medical history
New England Journal of Medicine 2013;368(2):14960
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She points to animal products like beef, poultry, fish, eggs, and dairy as B12-rich items, adding that some foods including breakfast cereals, some non-dairy beverages (like almond and soy milk), and meat substitutes are fortified with it