After I got the booster my weight has gone down; And for almost an entire week my glucose levels were actually low...sometimes it was going down 68, 67; Sometimes things just do not smell or taste right; Sometimes things just do not smell or taste right; He felt better like he is diabetic and his glucose level went to normal after getting the booster shot; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 58-year-old male patient received BNT162b2 (BNT162B2), on 14Dec2021 as dose 3 (booster), single (Lot number: FF2590) at the age of 57 years intramuscular, in left arm for covid-19 immunisation. The patient's relevant medical history included: "High cholesterol" (unspecified if ongoing), notes: High cholesterol; "Diabetes" (unspecified if ongoing), notes: Diabetes; "Edema" (unspecified if ongoing), notes: Edema; "Neuropathy" (unspecified if ongoing), notes: Neuropathy; "High blood pressure" (unspecified if ongoing), notes: High blood pressure.; "prostrate problems" (unspecified if ongoing), notes: prostrate problems (further not clarified). The patient took concomitant medications. Vaccination history included: BNT162b2 (Dose: 1, Lot number: EW0175, Anatomical site of administration of the vaccine: left arm, upper arm, the shoulder., route of administration: Intramuscular), administration date: 22Apr2021, when the patient was 57-year-old, for COVID-19 immunization; BNT162b2 (Dose: 2, Lot number: EW0165, Anatomical site of administration of the vaccine: left arm, upper arm, the shoulder., route of administration: Intramuscular), administration date: 17May2021, when the patient was 57-year-old, for COVID-19 immunization. The following information was reported: WEIGHT DECREASED (non-serious), outcome "unknown", described as "After I got the booster my weight has gone down"; BLOOD GLUCOSE DECREASED (non-serious), outcome "unknown", described as "And for almost an entire week my glucose levels were actually low...sometimes it was going down 68, 67"; PAROSMIA (non-serious), TASTE DISORDER (non-serious), outcome "unknown" and all described as "Sometimes things just do not smell or taste right"; THERAPEUTIC RESPONSE UNEXPECTED (non-serious), outcome "unknown", described as "He felt better like he is diabetic and his glucose level went to normal after getting the booster shot". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of weight decreased, blood glucose decreased, parosmia, taste disorder.  Other medical conditions: Consumer stated, "Oh! hope you have that much time. Yes, I have high blood pressure, high cholesterol, prostrate problems (further not clarified), I got the diabetes, I got neuropathy all over, edema, I need both my shoulders and knees replaced, the hands need surgery, I need about 9 surgeries (further not clarified) and the list goes on. Treatment: Consumer stated, "Just the regular over the counter stuff Ibuprofen, decongestants.  Additional information: Call was transferred from Support by (Name withheld). The consumer stated I had problems with glucose levels for years, like I am diabetic, like a dozen major health problems (Intent History). I am on a ton of different medications, about 5 or 6 just for diabetes and I had trouble controlling my glucose levels and after I got the booster my weight has gone down, my glucose levels kind of stabilized and for almost an entire week my glucose levels were actually low. I stopped all my diabetes medication (Further not clarified. Hence, captured as event conservatively and suspect captured as unspecified medication.) and my glucose levels would keep going low. Usually normal for me is like 150-130. When I usually go around a 100 or even a little longer at 100 I start to feel shaky sometimes it was going down 68, 67. I ended up to drink sodas and all sugary stuff just to get it back up (Intent treatment) and that is without the diabetes medication, completely stopped taking it. Now, I am on and I would just stop regularly, if it starts to go high, I start taking some of the regular stuff, some of the normal pills and injections.  No follow-up attempts are possible. No further information is expected.