בעזרת ה' יתברך-יום א' פ' בשלח, ז' שבט, שנת תשע"ט
I received your letter.
I beg you: be careful with your health; your children need a father who will raise them. If the doctor said you have diabetes, and warned you to refrain from eating sugar etc. don’t take it lightly.
Remain joyous and uplifted with all your strength; the holy Rebbe said (Likutei Maharan, Chelek 2, Siman 24): "מצוה גדולה להיות בשמחה", it is a great Mitzva to always be happy, and one should get rid of his misery and depression, "וכל החולאת הבאין על האדם, כולם באין רק מקלקול השמחה", disease and sickness only afflict a person because he is miserable or depressed. The Rebbe continues “even the doctors admit that all the problems or illnesses people suffer from, stem only from unhappiness, and Simcha is a Refuah for everything. When a person is happy his problems resolve.
You write that you have a hard time losing weight and therefore become disheartened and depressed; do you really think that will help the situation? It will only worsen it.
Be careful what you eat; even Shabbos and Yom Tov when it is a Mitzva to eat, one must still guard his health. The most vital thing to you should be your health.
Don’t despair; Hashem is with you. Open your mouth and just talk to him; empty your heart to him, and you will witness miracles.
I’m waiting to hear that you made a Siyum on Mishnayos, or on the Rebbe’s Seforim.