It is important to distinguish between complete and partial tears as it guides treatment decisions. Classic physical exam findings of complete tears include: antecubital pain and ecchymosis, non-palpable distal biceps tendon (abnormal hook test), proximal retraction of the biceps muscle, and weakness with supination and flexion. A partial tear often has a normal hook test but has pain with the examination. An MRI is most appropriate for confirmation of a partial distal biceps rupture, while an MRI is not always required for a complete tear if the exam is conclusive.
The reference by Vardakas et al reports a series of patients initially treated with conservative management for their partial biceps tendon tears. They were all then treated with operative fixation secondary to recalcitrant pain. They note significant improvement in pain at an average of 31 months in all 7 patients without any complications noted.
The role of nutrition in preventing and treating sarcopenia is less clear. Large, well-designed studies of nutrition particularly in combination with exercise are needed, ideally across healthcare settings. For now, basing nutritional guidance on the evidence available from the wider health context is probably the best approach with little contention in the goals of replacing vitamin D where deficient, and ensuring an adequate intake of calories and protein, although there is debate about whether currently recommended protein intake levels are optimal.  
This is especially true for Hollywood actors. Let’s take Manu Bennett, for example (pictured above). Steroids were a part of his winning the role of Crixus in Spartacus . He used them in his mid-thirties to build an impressive physique for a role as a MMA fighter. The movie deal fell through and a broke Bennett was forced to earn a living as a day laborer. But the producers of Spartacus saw his photo and wanted him for the gladiator role. Bennett immediately began training (this time without steroids) and re-gained most of his muscle. From day laborer to action star—I’d say his cycle paid off. He is now in his mid-40’s and hasn’t ruled out using steroids to prepare for future roles. Can you blame him?